diff --git a/app.js b/app.js
index d177cdde8d..b20ceefa7b 100644
--- a/app.js
+++ b/app.js
@@ -311,6 +311,8 @@ global.Tools = require('./tools.js').includeFormats();
 
 global.LoginServer = require('./loginserver.js');
 
+global.Ladders = require('./ladders-remote.js');
+
 global.Users = require('./users.js');
 
 global.Rooms = require('./rooms.js');
diff --git a/gulpfile.js b/gulpfile.js
index 19469bdf8b..d68a485e8d 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -16,7 +16,8 @@ var fileCache = new CacheSwap({tmpDir: '', cacheDirName: 'gulp-cache'});
 var globals = {};
 var globalList = [
 	'Config', 'ResourceMonitor', 'toId', 'Tools', 'LoginServer', 'Users', 'Rooms', 'Verifier',
-	'CommandParser', 'Simulator', 'Tournaments', 'Dnsbl', 'Cidr', 'Sockets', 'TeamValidator'
+	'CommandParser', 'Simulator', 'Tournaments', 'Dnsbl', 'Cidr', 'Sockets', 'TeamValidator',
+	'Ladders'
 ];
 globalList.forEach(function (identifier) {globals[identifier] = false;});
 
diff --git a/ladders-remote.js b/ladders-remote.js
new file mode 100644
index 0000000000..43f769fec4
--- /dev/null
+++ b/ladders-remote.js
@@ -0,0 +1,115 @@
+/**
+ * Ladder library
+ * Pokemon Showdown - http://pokemonshowdown.com/
+ *
+ * This file handles ladder rating retrieval.
+ *
+ * @license MIT license
+ */
+
+/* global Ladders: true */
+var Ladders = module.exports = getLadder;
+
+function getLadder(formatid) {
+	return new Ladder(formatid);
+}
+
+function Ladder(formatid) {
+	this.formatid = toId(formatid);
+}
+
+Ladder.prototype.getRating = function (userid) {
+	var formatid = this.formatid;
+	var user = Users.getExact(userid);
+	if (user && user.mmrCache[formatid]) {
+		return Promise.resolve(user.mmrCache[formatid]);
+	}
+	return new Promise(function (resolve, reject) {
+		LoginServer.request('mmr', {
+			format: formatid,
+			user: userid
+		}, function (data, statusCode, error) {
+			if (!data) return resolve(1000);
+			if (data.errorip) {
+				return resolve(1000);
+			}
+
+			var mmr = parseInt(data, 10);
+			if (isNaN(mmr)) return resolve(1000);
+			if (user.userid !== userid) return reject("Expired rating");
+
+			user.mmrCache[formatid] = mmr;
+			resolve(mmr);
+		});
+	});
+};
+
+Ladder.prototype.updateRating = function (p1name, p2name, p1score, room) {
+	var formatid = this.formatid;
+	var p1rating, p2rating;
+	room.update();
+	room.send('||Ladder updating...');
+	LoginServer.request('ladderupdate', {
+		p1: p1name,
+		p2: p2name,
+		score: p1score,
+		format: formatid
+	}, function (data, statusCode, error) {
+		if (!room.battle) {
+			console.log('room expired before ladder update was received');
+			return;
+		}
+		if (!data) {
+			room.add('||Ladder (probably) updated, but score could not be retrieved (' + error.message + ').');
+			// log the battle anyway
+			if (!Tools.getFormat(room.format).noLog) {
+				room.logBattle(p1score);
+			}
+			return;
+		} else if (data.errorip) {
+			room.add("||This server's request IP " + data.errorip + " is not a registered server.");
+			room.add("||We currently only support ladder ratings on registered servers.");
+			room.update();
+			return;
+		} else {
+			try {
+				p1rating = data.p1rating;
+				p2rating = data.p2rating;
+
+				var oldacre = Math.round(p1rating.oldacre);
+				var acre = Math.round(p1rating.acre);
+				var reasons = '' + (acre - oldacre) + ' for ' + (p1score > 0.99 ? 'winning' : (p1score < 0.01 ? 'losing' : 'tying'));
+				if (reasons.charAt(0) !== '-') reasons = '+' + reasons;
+				room.addRaw(Tools.escapeHTML(p1name) + '\'s rating: ' + oldacre + ' &rarr; <strong>' + acre + '</strong><br />(' + reasons + ')');
+
+				oldacre = Math.round(p2rating.oldacre);
+				acre = Math.round(p2rating.acre);
+				reasons = '' + (acre - oldacre) + ' for ' + (p1score > 0.99 ? 'losing' : (p1score < 0.01 ? 'winning' : 'tying'));
+				if (reasons.charAt(0) !== '-') reasons = '+' + reasons;
+				room.addRaw(Tools.escapeHTML(p2name) + '\'s rating: ' + oldacre + ' &rarr; <strong>' + acre + '</strong><br />(' + reasons + ')');
+
+				var p1 = Users.getExact(p1name);
+				if (p1) {
+					Users.getExact(p1name).mmrCache[formatid] = +p1rating.acre;
+				}
+				var p2 = Users.getExact(p2name);
+				if (p2) {
+					Users.getExact(p2name).mmrCache[formatid] = +p2rating.acre;
+				}
+				room.update();
+			} catch (e) {
+				room.addRaw('There was an error calculating rating changes.');
+				room.update();
+			}
+
+			if (!Tools.getFormat(formatid).noLog) {
+				room.logBattle(p1score, p1rating, p2rating);
+			}
+
+			if (!Tools.getFormat(formatid).noLog) {
+				room.logBattle(p1score, p1rating, p2rating);
+			}
+		}
+	});
+};
+
diff --git a/rooms.js b/rooms.js
index 68af635cff..7eeed7b3ab 100644
--- a/rooms.js
+++ b/rooms.js
@@ -539,13 +539,11 @@ var GlobalRoom = (function () {
 			time: new Date().getTime()
 		};
 		var self = this;
-		user.doWithMMR(formatid, function (mmr, error) {
-			if (error) {
-				user.popup("Connection to ladder server failed with error: " + error.message + "; please try again later");
-				return;
-			}
-			newSearch.rating = mmr;
+		Ladders(formatid).getRating(user.userid).then(function (rating) {
+			newSearch.rating = rating;
 			self.addSearch(newSearch, user, formatid);
+		}, function (error) {
+			user.popup("Connection to ladder server failed with error: " + error.message + "; please try again later");
 		});
 	};
 	GlobalRoom.prototype.matchmakingOK = function (search1, search2, user1, user2, formatid) {
@@ -930,62 +928,8 @@ var BattleRoom = (function () {
 				if (winner && !winner.registered) {
 					this.sendUser(winner, '|askreg|' + winner.userid);
 				}
-				var p1rating, p2rating;
 				// update rankings
-				this.push('|raw|Ladder updating...');
-				var self = this;
-				LoginServer.request('ladderupdate', {
-					p1: p1name,
-					p2: p2name,
-					score: p1score,
-					format: toId(rated.format)
-				}, function (data, statusCode, error) {
-					if (!self.battle) {
-						console.log('room expired before ladder update was received');
-						return;
-					}
-					if (!data) {
-						self.addRaw('Ladder (probably) updated, but score could not be retrieved (' + error.message + ').');
-						// log the battle anyway
-						if (!Tools.getFormat(self.format).noLog) {
-							self.logBattle(p1score);
-						}
-						return;
-					} else if (data.errorip) {
-						self.addRaw("This server's request IP " + data.errorip + " is not a registered server.");
-						return;
-					} else {
-						try {
-							p1rating = data.p1rating;
-							p2rating = data.p2rating;
-
-							//self.add("Ladder updated.");
-
-							var oldacre = Math.round(data.p1rating.oldacre);
-							var acre = Math.round(data.p1rating.acre);
-							var reasons = '' + (acre - oldacre) + ' for ' + (p1score > 0.99 ? 'winning' : (p1score < 0.01 ? 'losing' : 'tying'));
-							if (reasons.charAt(0) !== '-') reasons = '+' + reasons;
-							self.addRaw(Tools.escapeHTML(p1name) + '\'s rating: ' + oldacre + ' &rarr; <strong>' + acre + '</strong><br />(' + reasons + ')');
-
-							oldacre = Math.round(data.p2rating.oldacre);
-							acre = Math.round(data.p2rating.acre);
-							reasons = '' + (acre - oldacre) + ' for ' + (p1score > 0.99 ? 'losing' : (p1score < 0.01 ? 'winning' : 'tying'));
-							if (reasons.charAt(0) !== '-') reasons = '+' + reasons;
-							self.addRaw(Tools.escapeHTML(p2name) + '\'s rating: ' + oldacre + ' &rarr; <strong>' + acre + '</strong><br />(' + reasons + ')');
-
-							if (p1 && p1.userid === rated.p1) p1.cacheMMR(rated.format, data.p1rating);
-							if (p2 && p2.userid === rated.p2) p2.cacheMMR(rated.format, data.p2rating);
-							self.update();
-						} catch (e) {
-							self.addRaw('There was an error calculating rating changes.');
-							self.update();
-						}
-
-						if (!Tools.getFormat(self.format).noLog) {
-							self.logBattle(p1score, p1rating, p2rating);
-						}
-					}
-				});
+				Ladders(rated.format).updateRating(p1name, p2name, p1score, this);
 			}
 		} else if (Config.logchallenges) {
 			// Log challenges if the challenge logging config is enabled.
diff --git a/users.js b/users.js
index 413f89cbca..d7cdab6844 100644
--- a/users.js
+++ b/users.js
@@ -1260,40 +1260,6 @@ User = (function () {
 		}
 		return alts;
 	};
-	User.prototype.doWithMMR = function (formatid, callback) {
-		var self = this;
-		var userid = this.userid;
-		formatid = toId(formatid);
-
-		// this should relieve login server strain
-		// this.mmrCache[formatid] = 1000;
-
-		if (this.mmrCache[formatid]) {
-			callback(this.mmrCache[formatid]);
-			return;
-		}
-		LoginServer.request('mmr', {
-			format: formatid,
-			user: userid
-		}, function (data, statusCode, error) {
-			if (!data) return callback(1000, error || new Error("No data received"));
-			if (data.errorip) return self.popup("This server's request IP " + data.errorip + " is not a registered server.");
-
-			var mmr = parseInt(data, 10);
-			if (isNaN(mmr)) return callback(1000, error || new Error("Invalid rating"));
-			if (self.userid !== userid) return callback(1000, new Error("Expired rating"));
-
-			self.mmrCache[formatid] = mmr;
-			callback(mmr, null);
-		});
-	};
-	User.prototype.cacheMMR = function (formatid, mmr) {
-		if (typeof mmr === 'number') {
-			this.mmrCache[formatid] = mmr;
-		} else {
-			this.mmrCache[formatid] = Number(mmr.acre);
-		}
-	};
 	User.prototype.ban = function (noRecurse, userid) {
 		// recurse only once; the root for-loop already bans everything with your IP
 		if (!userid) userid = this.userid;