diff --git a/dev/scripts/setup-db.js b/dev/scripts/setup-db.js
index 50747df..c8bcf68 100644
--- a/dev/scripts/setup-db.js
+++ b/dev/scripts/setup-db.js
@@ -32,11 +32,28 @@ async function setupDatabase() {
   console.log(`🎯 Latest patch version: ${latestPatch}`);
 
   // Check if data directory exists and has files
+  // Support both old format (patch_matches.json) and new platform-specific format (patch_PLATFORM_matches.json)
   console.log('🔍 Checking for data files...');
+  const platforms = ['EUW1', 'EUN1', 'NA1', 'KR'];
   const dataFiles = [
-    { path: 'patches.json', required: true, description: 'Patches data' },
-    { path: `${latestPatch}_matches.json`, required: true, description: 'Match data' }
+    { path: 'patches.json', required: true, description: 'Patches data' }
   ];
+  
+  // Check for platform-specific match files
+  let foundPlatformFiles = [];
+  for (const platform of platforms) {
+    const platformFile = `${latestPatch}_${platform}_matches.json`;
+    const fullPath = path.join(dataDir, platformFile);
+    if (fs.existsSync(fullPath)) {
+      foundPlatformFiles.push(platform);
+      dataFiles.push({ path: platformFile, required: false, description: `Match data for ${platform}` });
+    }
+  }
+  
+  // If no platform-specific files found, look for old format
+  if (foundPlatformFiles.length === 0) {
+    dataFiles.push({ path: `${latestPatch}_matches.json`, required: true, description: 'Match data' });
+  }
 
   let filesExist = true;
   for (const file of dataFiles) {
@@ -80,14 +97,36 @@ async function setupDatabase() {
 
   // 6. Check existing matches count and import if needed
   console.log('Checking existing matches count...');
-  const matchCount = await getMatchCount(latestPatch);
-  console.log(`📊 Current matches in database: ${matchCount}`);
   
-  if (matchCount < 100) {
-    console.log('📥 Importing matches (this may take a while)...');
-    await importMatchesData(latestPatch);
+  // Check for platform-specific collections or fall back to old format
+  const existingPlatforms = await getExistingPlatforms(latestPatch);
+  
+  if (existingPlatforms.length > 0) {
+    console.log(`📊 Found platform-specific collections: ${existingPlatforms.join(', ')}`);
+    let totalMatches = 0;
+    for (const platform of existingPlatforms) {
+      const count = await getMatchCount(latestPatch, platform);
+      console.log(`  ${platform}: ${count} matches`);
+      totalMatches += count;
+    }
+    console.log(`📊 Total matches in database: ${totalMatches}`);
+    
+    if (totalMatches < 100) {
+      console.log('📥 Importing matches (this may take a while)...');
+      await importMatchesData(latestPatch, foundPlatformFiles);
+    } else {
+      console.log('✅ Skipping matches import - sufficient data already present');
+    }
   } else {
-    console.log('✅ Skipping matches import - sufficient data already present');
+    const matchCount = await getMatchCount(latestPatch);
+    console.log(`📊 Current matches in database: ${matchCount}`);
+    
+    if (matchCount < 100) {
+      console.log('📥 Importing matches (this may take a while)...');
+      await importMatchesData(latestPatch, foundPlatformFiles);
+    } else {
+      console.log('✅ Skipping matches import - sufficient data already present');
+    }
   }
 
   // 7. Fetch CDragon data for the current patch
@@ -277,19 +316,42 @@ async function importPatchesData() {
   }
 }
 
-async function importMatchesData(patchVersion) {
-  const matchesFile = path.join(__dirname, '../data', `${patchVersion}_matches.json`);
-  const collectionName = patchVersion;
-
+async function importMatchesData(patchVersion, foundPlatformFiles = []) {
+  const dataDir = path.join(__dirname, '../data');
+  
   try {
-    const result = execSync(
-      `node ${path.join(__dirname, 'process-matches.js')} ${matchesFile} ${collectionName} 1000`,
-      {
-        stdio: 'inherit',
-        env: { ...process.env, MONGO_URI: getMongoUri() }
+    // If platform-specific files were found, import each one
+    if (foundPlatformFiles.length > 0) {
+      for (const platform of foundPlatformFiles) {
+        const matchesFile = path.join(dataDir, `${patchVersion}_${platform}_matches.json`);
+        const collectionName = `${patchVersion}_${platform}`;
+        
+        if (fs.existsSync(matchesFile)) {
+          console.log(`📥 Importing matches for ${platform}...`);
+          execSync(
+            `node ${path.join(__dirname, 'process-matches.js')} ${matchesFile} ${collectionName} 1000`,
+            {
+              stdio: 'inherit',
+              env: { ...process.env, MONGO_URI: getMongoUri() }
+            }
+          );
+          console.log(`✅ Matches import completed for ${platform}`);
+        }
       }
-    );
-    console.log('✅ Matches import completed');
+    } else {
+      // Fall back to old format (single file without platform suffix)
+      const matchesFile = path.join(dataDir, `${patchVersion}_matches.json`);
+      const collectionName = patchVersion;
+      
+      execSync(
+        `node ${path.join(__dirname, 'process-matches.js')} ${matchesFile} ${collectionName} 1000`,
+        {
+          stdio: 'inherit',
+          env: { ...process.env, MONGO_URI: getMongoUri() }
+        }
+      );
+      console.log('✅ Matches import completed');
+    }
   } catch (error) {
     console.error('❌ Failed to import matches:', error);
     throw error;
@@ -344,13 +406,14 @@ async function fetchCDragonData() {
   }
 }
 
-async function getMatchCount(patchVersion) {
+async function getMatchCount(patchVersion, platform = null) {
   const client = new MongoClient(getMongoUri());
   await client.connect();
 
   try {
     const db = client.db('matches');
-    const collection = db.collection(patchVersion);
+    const collectionName = platform ? `${patchVersion}_${platform}` : patchVersion;
+    const collection = db.collection(collectionName);
     const count = await collection.countDocuments();
     return count;
   } catch (error) {
@@ -361,6 +424,33 @@ async function getMatchCount(patchVersion) {
   }
 }
 
+async function getExistingPlatforms(patchVersion) {
+  const client = new MongoClient(getMongoUri());
+  await client.connect();
+
+  try {
+    const db = client.db('matches');
+    const collections = await db.listCollections().toArray();
+    const collectionNames = collections.map(c => c.name);
+    
+    const platforms = ['EUW1', 'EUN1', 'NA1', 'KR'];
+    const existingPlatforms = [];
+    
+    for (const platform of platforms) {
+      if (collectionNames.includes(`${patchVersion}_${platform}`)) {
+        existingPlatforms.push(platform);
+      }
+    }
+    
+    return existingPlatforms;
+  } catch (error) {
+    console.error('❌ Failed to get existing platforms:', error);
+    return [];
+  } finally {
+    await client.close();
+  }
+}
+
 function getMongoUri() {
   return process.env.MONGO_URI || 'mongodb://root:password@localhost:27017/buildpath?authSource=admin';
 }
diff --git a/frontend/components/nav/SideBar.vue b/frontend/components/nav/SideBar.vue
index c8e6d2c..dfaa51d 100644
--- a/frontend/components/nav/SideBar.vue
+++ b/frontend/components/nav/SideBar.vue
@@ -137,7 +137,10 @@ if (route.path.startsWith('/tierlist/')) {
         <h3 style="font-size: 18px; font-weight: 200; opacity: 0.5">Loading stats...</h3>
       </template>
       <h3 style="font-size: 18px; font-weight: 200; margin-top: 10px; margin-bottom: 10px">
-        EUW Challenger only
+        Challenger only
+      </h3>
+      <h3 style="font-size: 18px; font-weight: 200; margin-top: 10px; margin-bottom: 10px">
+        EUW/EUNE/NA/KR
       </h3>
       <NuxtLink to="/about"><h3>About</h3></NuxtLink>
       <h2 style="font-size: 10px; font-weight: 200; margin-top: 3px; margin-right: 10px">
diff --git a/frontend/server/api/stats.ts b/frontend/server/api/stats.ts
index b41ef36..371bdd6 100644
--- a/frontend/server/api/stats.ts
+++ b/frontend/server/api/stats.ts
@@ -1,19 +1,43 @@
 import type { MongoClient } from 'mongodb'
-import { connectToDatabase, fetchLatestPatch } from '../utils/mongo'
+import { connectToDatabase, fetchLatestPatch, getAvailablePlatforms } from '../utils/mongo'
 
 async function fetchGameCount(client: MongoClient, patch: string) {
   const database = client.db('matches')
+
+  // Check for platform-specific collections
+  const platforms = await getAvailablePlatforms(client, patch)
+
+  if (platforms.length > 0) {
+    // Sum counts from all platform-specific collections
+    let totalCount = 0
+    const platformCounts: Record<string, number> = {}
+
+    for (const platform of platforms) {
+      const collection = database.collection(`${patch}_${platform}`)
+      const count = await collection.countDocuments()
+      platformCounts[platform] = count
+      totalCount += count
+    }
+
+    return { total: totalCount, platforms: platformCounts }
+  }
+
+  // Fall back to old format (single collection)
   const matches = database.collection(patch)
   const count = await matches.countDocuments()
-  return count
+  return { total: count, platforms: {} }
 }
 
 export default defineEventHandler(async _ => {
   const client = await connectToDatabase()
   const latestPatch = await fetchLatestPatch(client)
-  const gameCount = await fetchGameCount(client, latestPatch)
+  const gameCountData = await fetchGameCount(client, latestPatch)
 
   await client.close()
 
-  return { patch: latestPatch, count: gameCount }
+  return {
+    patch: latestPatch,
+    count: gameCountData.total,
+    platformCounts: gameCountData.platforms
+  }
 })
diff --git a/frontend/server/utils/mongo.ts b/frontend/server/utils/mongo.ts
index 887b47e..c715eea 100644
--- a/frontend/server/utils/mongo.ts
+++ b/frontend/server/utils/mongo.ts
@@ -1,5 +1,9 @@
 import { MongoClient } from 'mongodb'
 
+// Available platforms for region-specific match data
+const PLATFORMS = ['EUW1', 'EUN1', 'NA1', 'KR'] as const
+type Platform = (typeof PLATFORMS)[number]
+
 async function connectToDatabase() {
   // Create a MongoClient with a MongoClientOptions object to set the Stable API version
   let uri = `mongodb://${process.env.MONGO_USER}:${process.env.MONGO_PASS}@${process.env.MONGO_HOST}`
@@ -22,4 +26,25 @@ async function fetchLatestPatch(client: MongoClient) {
   return latestPatch!.patch as string
 }
 
-export { connectToDatabase, fetchLatestPatch }
+/**
+ * Get available platforms for a given patch by checking which match collections exist
+ * Note: Match collections are platform-specific (e.g., "15.1_EUW1")
+ * Champion collections are aggregated across all platforms (e.g., "15.1")
+ */
+async function getAvailablePlatforms(client: MongoClient, patch: string): Promise<Platform[]> {
+  const matchesDb = client.db('matches')
+  const collections = await matchesDb.listCollections().toArray()
+  const collectionNames = collections.map(c => c.name)
+
+  const availablePlatforms: Platform[] = []
+  for (const platform of PLATFORMS) {
+    if (collectionNames.includes(`${patch}_${platform}`)) {
+      availablePlatforms.push(platform)
+    }
+  }
+
+  return availablePlatforms
+}
+
+export { connectToDatabase, fetchLatestPatch, getAvailablePlatforms, PLATFORMS }
+export type { Platform }
diff --git a/match_collector/champion_stat.ts b/match_collector/champion_stat.ts
index a26645f..fac2a39 100644
--- a/match_collector/champion_stat.ts
+++ b/match_collector/champion_stat.ts
@@ -218,7 +218,8 @@ function handleMatchBuilds(
   match: Match,
   participant: Participant,
   participantIndex: number,
-  builds: Builds
+  builds: Builds,
+  platform?: string
 ) {
   const timeline: Timeline = match.timeline
 
@@ -226,7 +227,7 @@ function handleMatchBuilds(
   const build = findOrCreateBuild(builds, participant)
   build.count += 1
 
-  const items: Array<{ itemId: number; goldAdvantage: GoldAdvantageTag }> = []
+  const items: Array<{ itemId: number; goldAdvantage: GoldAdvantageTag; platform?: string }> = []
   for (const frame of timeline.info.frames) {
     for (const event of frame.events) {
       if (event.participantId != participantIndex) continue
@@ -301,7 +302,7 @@ function handleMatchBuilds(
 
       // Calculate gold advantage at time of purchase
       const goldAdvantage = calculateGoldAdvantage(match, frame, participantIndex)
-      items.push({ itemId: event.itemId, goldAdvantage })
+      items.push({ itemId: event.itemId, goldAdvantage, platform })
     }
   }
 
@@ -312,7 +313,7 @@ function handleMatchBuilds(
   }
 }
 
-function handleMatch(match: Match, champions: Map<number, ChampionData>) {
+function handleMatch(match: Match, champions: Map<number, ChampionData>, platform?: string) {
   let participantIndex = 0
   for (const participant of match.info.participants) {
     participantIndex += 1
@@ -395,17 +396,19 @@ function handleMatch(match: Match, champions: Map<number, ChampionData>) {
     }
 
     // Items and runes (builds)
-    handleMatchBuilds(match, participant, participantIndex, lane.builds)
+    handleMatchBuilds(match, participant, participantIndex, lane.builds, platform)
   }
 }
 
 async function handleMatchList(
   client: MongoClient,
   patch: string,
-  champions: Map<number, ChampionData>
+  champions: Map<number, ChampionData>,
+  platform?: string
 ) {
   const database = client.db('matches')
-  const matches = database.collection(patch)
+  const collectionName = platform ? `${patch}_${platform}` : patch
+  const matches = database.collection(collectionName)
   const allMatches = matches.find()
   const totalMatches: number = await matches.countDocuments()
 
@@ -415,7 +418,7 @@ async function handleMatchList(
       '\rComputing champion stats, game entry ' + currentMatch + '/' + totalMatches + ' ... '
     )
     currentMatch += 1
-    handleMatch(match as unknown as Match, champions)
+    handleMatch(match as unknown as Match, champions, platform)
   }
 
   return totalMatches
@@ -696,7 +699,7 @@ async function championList() {
   return list.slice(1)
 }
 
-async function makeChampionsStats(client: MongoClient, patch: string) {
+async function makeChampionsStats(client: MongoClient, patch: string, platforms: string[] = []) {
   const globalItems = await itemList()
   for (const item of globalItems) {
     itemDict.set(item.id, item)
@@ -705,7 +708,7 @@ async function makeChampionsStats(client: MongoClient, patch: string) {
   const list = await championList()
   console.log('Generating stats for ' + list.length + ' champions')
 
-  // Pre-generate list of champions
+  // Pre-generate list of champions (shared across all platforms)
   const champions: Map<number, ChampionData> = new Map()
   for (const champion of list) {
     champions.set(champion.id, {
@@ -716,10 +719,18 @@ async function makeChampionsStats(client: MongoClient, patch: string) {
     })
   }
 
-  // Loop through all matches to generate stats
-  const totalMatches = await handleMatchList(client, patch, champions)
+  // Process matches from all platforms, merging into the same champions map
+  let totalMatches = 0
+  for (const platform of platforms) {
+    console.log(`\n=== Processing matches from platform: ${platform} ===`)
+    const platformMatches = await handleMatchList(client, patch, champions, platform)
+    totalMatches += platformMatches
+    console.log(`Processed ${platformMatches} matches from ${platform}`)
+  }
 
-  // Finalize and save stats for every champion
+  console.log(`\n=== Total matches processed: ${totalMatches} ===`)
+
+  // Finalize and save stats to a single champions collection
   const database = client.db('champions')
   const collection = database.collection(patch)
   for (const champion of list) {
@@ -729,6 +740,7 @@ async function makeChampionsStats(client: MongoClient, patch: string) {
 
   // Create alias-index for better key-find
   await collection.createIndex({ alias: 1 })
+  console.log(`Stats saved to collection: ${patch}`)
 }
 
 export default { makeChampionsStats }
diff --git a/match_collector/index.ts b/match_collector/index.ts
index c3839ff..3ca90b2 100644
--- a/match_collector/index.ts
+++ b/match_collector/index.ts
@@ -1,4 +1,3 @@
-const base = 'https://euw1.api.riotgames.com'
 const api_key = process.env.RIOT_API_KEY
 const sleep_minutes = 12
 
@@ -7,6 +6,22 @@ import { MongoClient } from 'mongodb'
 import champion_stat from './champion_stat'
 import { Match } from './api'
 
+// Region configuration: platform -> regional routing value
+const PLATFORMS: Record<string, string> = {
+  EUW1: 'EUROPE',
+  EUN1: 'EUROPE',
+  NA1: 'AMERICAS',
+  KR: 'ASIA'
+}
+
+function getPlatformBaseUrl(platform: string): string {
+  return `https://${platform.toLowerCase()}.api.riotgames.com`
+}
+
+function getRegionalBaseUrl(region: string): string {
+  return `https://${region.toLowerCase()}.api.riotgames.com`
+}
+
 main()
 
 async function main() {
@@ -25,42 +40,51 @@ async function main() {
     'Connected to database, latest patch ' + latestPatch + ' was epoch: ' + latestPatchTime
   )
 
-  const alreadySeenGameList = await alreadySeenGames(client, latestPatch)
-  console.log('We already have ' + alreadySeenGameList.length + ' matches for this patch !')
-
   console.log('Using RIOT_API_KEY: ' + api_key)
   if (api_key != null && api_key != undefined && api_key != '') {
-    const challengerLeague = await fetchChallengerLeague()
-    console.log('ChallengerLeague: got ' + challengerLeague.entries.length + ' entries')
+    // Iterate through all platforms
+    for (const [platform, region] of Object.entries(PLATFORMS)) {
+      console.log(`\n=== Processing platform: ${platform} (region: ${region}) ===`)
 
-    const gameList : string[] = []
-    let i = 0
-    for (const challenger of challengerLeague.entries) {
-      console.log('Entry ' + i + '/' + challengerLeague.entries.length + ' ...')
-      const puuid = challenger.puuid
-      const challengerGameList = await summonerGameList(puuid, latestPatchTime)
-      for (const game of challengerGameList) {
-        if (!gameList.includes(game) && !alreadySeenGameList.includes(game)) {
-          gameList.push(game)
+      const alreadySeenGameList = await alreadySeenGames(client, latestPatch, platform)
+      console.log(
+        'We already have ' + alreadySeenGameList.length + ' matches for this patch/platform !'
+      )
+
+      const challengerLeague = await fetchChallengerLeague(platform)
+      console.log('ChallengerLeague: got ' + challengerLeague.entries.length + ' entries')
+
+      const gameList: string[] = []
+      let i = 0
+      for (const challenger of challengerLeague.entries) {
+        console.log('Entry ' + i + '/' + challengerLeague.entries.length + ' ...')
+        const puuid = challenger.puuid
+        const challengerGameList = await summonerGameList(puuid, latestPatchTime, region)
+        for (const game of challengerGameList) {
+          if (!gameList.includes(game) && !alreadySeenGameList.includes(game)) {
+            gameList.push(game)
+          }
         }
+        i++
       }
-      i++
-    }
 
-    console.log('Games: got ' + gameList.length + ' entries')
-    i = 0
-    for (const game of gameList) {
-      console.log('Entry ' + i + '/' + gameList.length + ' ...')
-      const gameMatch = await match(game)
-      const gameTimeline = await matchTimeline(game)
-      gameMatch.timeline = gameTimeline
-      await saveMatch(client, gameMatch, latestPatch)
-      i++
+      console.log('Games: got ' + gameList.length + ' entries for ' + platform)
+      i = 0
+      for (const game of gameList) {
+        console.log('Entry ' + i + '/' + gameList.length + ' ...')
+        // Determine region from matchId (format: REGION_matchId)
+        const matchRegion = game.split('_')[0]
+        const gameMatch = await match(game, matchRegion)
+        const gameTimeline = await matchTimeline(game, matchRegion)
+        gameMatch.timeline = gameTimeline
+        await saveMatch(client, gameMatch, latestPatch, platform)
+        i++
+      }
     }
   }
 
   console.log('Generating stats...')
-  await champion_stat.makeChampionsStats(client, latestPatch)
+  await champion_stat.makeChampionsStats(client, latestPatch, Object.keys(PLATFORMS))
 
   console.log('All done. Closing client.')
   await client.close()
@@ -113,10 +137,11 @@ async function fetchLatestPatchDate(client: MongoClient) {
   return [latestPatch!.patch, Math.floor(latestPatch!.date.valueOf() / 1000)]
 }
 
-async function fetchChallengerLeague() {
+async function fetchChallengerLeague(platform: string) {
   const queue = 'RANKED_SOLO_5x5'
   const endpoint = `/lol/league/v4/challengerleagues/by-queue/${queue}`
-  const url = `${base}${endpoint}?api_key=${api_key}`
+  const baseUrl = getPlatformBaseUrl(platform)
+  const url = `${baseUrl}${endpoint}?api_key=${api_key}`
 
   const challengerLeagueResponse = await handleRateLimit(new URL(url))
 
@@ -126,10 +151,10 @@ async function fetchChallengerLeague() {
   return challengerLeague
 }
 
-async function summonerGameList(puuid: string, startTime: string) {
-  const base = 'https://europe.api.riotgames.com'
+async function summonerGameList(puuid: string, startTime: string, region: string) {
+  const baseUrl = getRegionalBaseUrl(region)
   const endpoint = `/lol/match/v5/matches/by-puuid/${puuid}/ids`
-  const url = `${base}${endpoint}?queue=420&type=ranked&startTime=${startTime}&api_key=${api_key}`
+  const url = `${baseUrl}${endpoint}?queue=420&type=ranked&startTime=${startTime}&api_key=${api_key}`
 
   const gameListResponse = await handleRateLimit(new URL(url))
   handleError(gameListResponse)
@@ -138,10 +163,10 @@ async function summonerGameList(puuid: string, startTime: string) {
   return gameList
 }
 
-async function match(matchId: string) {
-  const base = 'https://europe.api.riotgames.com'
+async function match(matchId: string, region: string) {
+  const baseUrl = getRegionalBaseUrl(region)
   const endpoint = `/lol/match/v5/matches/${matchId}`
-  const url = `${base}${endpoint}?api_key=${api_key}`
+  const url = `${baseUrl}${endpoint}?api_key=${api_key}`
 
   const matchResponse = await handleRateLimit(new URL(url))
   handleError(matchResponse)
@@ -150,10 +175,10 @@ async function match(matchId: string) {
   return match
 }
 
-async function matchTimeline(matchId: string) {
-  const base = 'https://europe.api.riotgames.com'
+async function matchTimeline(matchId: string, region: string) {
+  const baseUrl = getRegionalBaseUrl(region)
   const endpoint = `/lol/match/v5/matches/${matchId}/timeline`
-  const url = `${base}${endpoint}?api_key=${api_key}`
+  const url = `${baseUrl}${endpoint}?api_key=${api_key}`
 
   const timelineResponse = await handleRateLimit(new URL(url))
   handleError(timelineResponse)
@@ -162,17 +187,19 @@ async function matchTimeline(matchId: string) {
   return timeline
 }
 
-async function alreadySeenGames(client: MongoClient, latestPatch: string) {
+async function alreadySeenGames(client: MongoClient, latestPatch: string, platform: string) {
   const database = client.db('matches')
-  const matches = database.collection(latestPatch)
+  const collectionName = `${latestPatch}_${platform}`
+  const matches = database.collection(collectionName)
 
   const alreadySeen = await matches.distinct('metadata.matchId')
   return alreadySeen
 }
 
-async function saveMatch(client: MongoClient, match: Match, latestPatch: string) {
+async function saveMatch(client: MongoClient, match: Match, latestPatch: string, platform: string) {
   const database = client.db('matches')
-  const matches = database.collection(latestPatch)
+  const collectionName = `${latestPatch}_${platform}`
+  const matches = database.collection(collectionName)
   await matches.insertOne(match)
 }
 
@@ -187,10 +214,15 @@ async function runWithPreloadedData() {
     const [latestPatch] = await fetchLatestPatchDate(client)
     console.log(`Latest patch: ${latestPatch}`)
 
-    // Check if we have matches for this patch
+    // Check if we have matches for this patch (including platform-specific collections)
     const matchesDb = client.db('matches')
     const collections = await matchesDb.listCollections().toArray()
-    const patchCollections = collections.map(c => c.name).filter(name => name === latestPatch)
+    const collectionNames = collections.map(c => c.name)
+
+    // Find collections for this patch (both global and platform-specific)
+    const patchCollections = collectionNames.filter(
+      name => name === latestPatch || name.startsWith(`${latestPatch}_`)
+    )
 
     if (patchCollections.length === 0) {
       console.error(`❌ No match data found for patch ${latestPatch}`)
@@ -199,13 +231,21 @@ async function runWithPreloadedData() {
       return
     }
 
-    console.log(`Found ${patchCollections.length} match collection(s)`)
+    console.log(
+      `Found ${patchCollections.length} match collection(s): ${patchCollections.join(', ')}`
+    )
 
-    // Generate stats for each patch with data
-    for (const patch of patchCollections) {
-      console.log(`Generating stats for patch ${patch}...`)
-      await champion_stat.makeChampionsStats(client, patch)
-      console.log(`Stats generated for patch ${patch}`)
+    // Extract platforms from collection names (e.g., "15.1_EUW1" -> "EUW1")
+    const platforms = patchCollections
+      .filter(name => name.startsWith(`${latestPatch}_`))
+      .map(name => name.replace(`${latestPatch}_`, ''))
+
+    // Generate stats for each platform
+    if (platforms.length > 0) {
+      await champion_stat.makeChampionsStats(client, latestPatch, platforms)
+    } else {
+      // Fallback for old-style collections without platform suffix
+      await champion_stat.makeChampionsStats(client, latestPatch)
     }
 
     console.log('🎉 All stats generated successfully!')
diff --git a/match_collector/item_tree.ts b/match_collector/item_tree.ts
index 5d95fca..8747e6e 100644
--- a/match_collector/item_tree.ts
+++ b/match_collector/item_tree.ts
@@ -1,5 +1,12 @@
 type GoldAdvantageTag = 'ahead' | 'behind' | 'even'
 
+type PlatformCounts = {
+  euw: number
+  eun: number
+  na: number
+  kr: number
+}
+
 type ItemTree = {
   data: number | undefined
   count: number
@@ -12,6 +19,13 @@ type ItemTree = {
     evenCount: number
     meanGold: number
   }
+
+  // Platform tracking
+  platformCount: PlatformCounts
+}
+
+function initPlatformCounts(): PlatformCounts {
+  return { euw: 0, eun: 0, na: 0, kr: 0 }
 }
 
 function treeInit(): ItemTree {
@@ -19,16 +33,8 @@ function treeInit(): ItemTree {
     data: undefined,
     count: 0,
     children: [],
-    boughtWhen: { aheadCount: 0, behindCount: 0, evenCount: 0, meanGold: 0 }
-  }
-}
-
-function treeNode(data: number, count: number): ItemTree {
-  return {
-    data: data,
-    count: count,
-    children: [],
-    boughtWhen: { aheadCount: 0, behindCount: 0, evenCount: 0, meanGold: 0 }
+    boughtWhen: { aheadCount: 0, behindCount: 0, evenCount: 0, meanGold: 0 },
+    platformCount: initPlatformCounts()
   }
 }
 
@@ -49,6 +55,12 @@ function nodeMerge(itemtree: ItemTree, node: ItemTree) {
       child.boughtWhen.evenCount += node.boughtWhen.evenCount
       child.boughtWhen.behindCount += node.boughtWhen.behindCount
 
+      // Merge platform counts
+      child.platformCount.euw += node.platformCount.euw
+      child.platformCount.eun += node.platformCount.eun
+      child.platformCount.na += node.platformCount.na
+      child.platformCount.kr += node.platformCount.kr
+
       next = child
       break
     }
@@ -56,7 +68,13 @@ function nodeMerge(itemtree: ItemTree, node: ItemTree) {
 
   // If not found, add item node at this level
   if (next == null && item !== undefined) {
-    next = treeNode(item, count)
+    next = {
+      data: item,
+      count: count,
+      children: [],
+      boughtWhen: { ...node.boughtWhen },
+      platformCount: { ...node.platformCount }
+    }
     itemtree.children.push(next)
   }
 
@@ -68,11 +86,12 @@ function nodeMerge(itemtree: ItemTree, node: ItemTree) {
  */
 function treeMerge(
   itemtree: ItemTree,
-  items: Array<{ itemId: number; goldAdvantage: GoldAdvantageTag }>
+  items: Array<{ itemId: number; goldAdvantage: GoldAdvantageTag; platform?: string }>
 ) {
   let current = itemtree
 
   for (const item of items) {
+    const platformKey = item.platform ? item.platform.toLowerCase() : null
     current = nodeMerge(current, {
       data: item.itemId,
       count: 1,
@@ -82,7 +101,13 @@ function treeMerge(
         behindCount: item.goldAdvantage == 'behind' ? 1 : 0,
         meanGold: 0
       },
-      children: []
+      children: [],
+      platformCount: {
+        euw: platformKey === 'euw1' ? 1 : 0,
+        eun: platformKey === 'eun1' ? 1 : 0,
+        na: platformKey === 'na1' ? 1 : 0,
+        kr: platformKey === 'kr' ? 1 : 0
+      }
     })
   }
 }
@@ -96,7 +121,8 @@ function treeCutBranches(itemtree: ItemTree, thresholdCount: number, thresholdPe
         data: undefined,
         count: +Infinity,
         children: [],
-        boughtWhen: { aheadCount: 0, behindCount: 0, evenCount: 0, meanGold: 0 }
+        boughtWhen: { aheadCount: 0, behindCount: 0, evenCount: 0, meanGold: 0 },
+        platformCount: initPlatformCounts()
       }
     )
     itemtree.children.splice(itemtree.children.indexOf(leastUsedBranch), 1)
@@ -137,6 +163,12 @@ function treeClone(tree: ItemTree): ItemTree {
       behindCount: tree.boughtWhen.behindCount,
       evenCount: tree.boughtWhen.evenCount,
       meanGold: tree.boughtWhen.meanGold
+    },
+    platformCount: {
+      euw: tree.platformCount.euw,
+      eun: tree.platformCount.eun,
+      na: tree.platformCount.na,
+      kr: tree.platformCount.kr
     }
   }
 }
@@ -148,6 +180,17 @@ function treeMergeTree(t1: ItemTree, t2: ItemTree): ItemTree {
   // Merge counts for the root
   t1.count += t2.count
 
+  // Merge platform counts
+  t1.platformCount.euw += t2.platformCount.euw
+  t1.platformCount.eun += t2.platformCount.eun
+  t1.platformCount.na += t2.platformCount.na
+  t1.platformCount.kr += t2.platformCount.kr
+
+  // Merge boughtWhen
+  t1.boughtWhen.aheadCount += t2.boughtWhen.aheadCount
+  t1.boughtWhen.evenCount += t2.boughtWhen.evenCount
+  t1.boughtWhen.behindCount += t2.boughtWhen.behindCount
+
   // Merge children from t2 into t1
   for (const child2 of t2.children) {
     // Find matching child in t1 (same data value)
@@ -225,6 +268,7 @@ function areTreeSimilars(t1: ItemTree, t2: ItemTree): number {
 
 export {
   ItemTree,
+  PlatformCounts,
   GoldAdvantageTag,
   treeMerge,
   treeInit,