diff --git a/traque-back/admin_socket.js b/traque-back/admin_socket.js
index 1d4d58d..feb151c 100644
--- a/traque-back/admin_socket.js
+++ b/traque-back/admin_socket.js
@@ -2,6 +2,8 @@ import { io, game, penaltyController } from "./index.js";
 import { playersBroadcast, sendUpdatedTeamInformations } from "./team_socket.js";
 
 import { config } from "dotenv";
+import { currentZone, initZone, removeZone } from "./zone_manager.js";
+import { GameState } from "./game.js";
 config()
 
 const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD;
@@ -47,12 +49,7 @@ export function initAdminSocketHandler() {
                 //Other settings that need initialization
                 socket.emit("penalty_settings", penaltyController.settings)
                 socket.emit("game_settings", game.settings)
-                socket.emit("zone_settings", game.zone.zoneSettings)
-                socket.emit("zone", game.zone.currentZone)
-                socket.emit("new_zone", {
-                    begin: game.zone.currentStartZone,
-                    end: game.zone.nextZone
-                })
+                socket.emit("zone", currentZone)
 
             } else {
                 //Attempt unsuccessful
@@ -72,20 +69,26 @@ export function initAdminSocketHandler() {
             playersBroadcast("game_settings", game.settings);
         })
 
-        socket.on("set_zone_settings", (settings) => {
+        socket.on("set_zone", (zone) => {
             if (!loggedIn) {
                 socket.emit("error", "Not logged in");
                 return;
             }
-            if (!game.setZoneSettings(settings)) {
-                socket.emit("error", "Error changing zone");
-                socket.emit("zone_settings", game.zone.zoneSettings) //Still broadcast the old config to the client who submited an incorrect config to keep the client up to date
-            } else {
-                secureAdminBroadcast("zone_settings", game.zone.zoneSettings)
+            if(game.state != GameState.PLAYING) {
+                initZone(zone)
+            }else {
+                socket.emit("error", "Game is not in setup state")
             }
-
         })
 
+        socket.on("remove_zone", (zone, time) => {
+            if (!loggedIn) {
+                socket.emit("error", "Not logged in");
+                return;
+            }
+            removeZone(zone, time)
+        });
+
         socket.on("set_penalty_settings", (settings) => {
             if (!loggedIn) {
                 socket.emit("error", "Not logged in");
diff --git a/traque-back/game.js b/traque-back/game.js
index 9e9d6f3..f424137 100644
--- a/traque-back/game.js
+++ b/traque-back/game.js
@@ -2,7 +2,7 @@ import { secureAdminBroadcast } from "./admin_socket.js";
 import { penaltyController } from "./index.js";
 import { isInCircle } from "./map_utils.js";
 import { playersBroadcast, sendUpdatedTeamInformations } from "./team_socket.js";
-import { ZoneManager } from "./zone_manager.js";
+import { resetZone } from "./zone_manager.js";
 
 export const GameState = {
     SETUP: "setup",
@@ -12,10 +12,9 @@ export const GameState = {
 }
 
 export default class Game {
-    constructor(onUpdateZone, onUpdateNewZone) {
+    constructor() {
         this.teams = [];
         this.state = GameState.SETUP;
-        this.zone = new ZoneManager(onUpdateZone, onUpdateNewZone)
         this.settings = {
             loserEndGameMessage: "",
             winnerEndGameMessage: "",
@@ -36,19 +35,9 @@ export default class Game {
         //The game has started
         if (newState == GameState.PLAYING) {
             penaltyController.start();
-            if (!this.zone.ready()) {
-                return false;
-            }
             this.initLastSentLocations();
-            this.zone.reset()
-            //If the zone cannot be setup, reset everything
-            if (!this.zone.start()) {
-                this.setState(GameState.SETUP);
-                return;
-            }
         }
         if (newState != GameState.PLAYING) {
-            this.zone.reset();
             penaltyController.stop();
         }
         //Game reset
@@ -235,23 +224,8 @@ export default class Game {
         this.updateTeamChasing();
     }
 
-    /**
-     * Change the settings of the Zone manager
-     * The game should not be in PLAYING or FINISHED state
-     * @param {Object} newSettings The object containing the settings to be changed
-     * @returns false if failed
-     */
-    setZoneSettings(newSettings) {
-        //cannot change zones while playing
-        if (this.state == GameState.PLAYING || this.state == GameState.FINISHED) {
-            return false;
-        }
-        return this.zone.udpateSettings(newSettings)
-    }
-
     finishGame() {
         this.setState(GameState.FINISHED);
-        this.zone.reset();
         playersBroadcast("game_state", this.state);
     }
 }
\ No newline at end of file
diff --git a/traque-back/index.js b/traque-back/index.js
index 88b2a4d..f031bae 100644
--- a/traque-back/index.js
+++ b/traque-back/index.js
@@ -35,19 +35,7 @@ export const io = new Server(httpsServer, {
   }
 });
 
-//Zone update broadcast function, called by the game object
-function onUpdateNewZone(newZone) {
-  playersBroadcast("new_zone", newZone)
-  secureAdminBroadcast("new_zone", newZone)
-}
-
-function onUpdateZone(zone) {
-  playersBroadcast("zone", zone)
-  secureAdminBroadcast("zone", zone)
-}
-
-
-export const game = new Game(onUpdateZone, onUpdateNewZone);
+export const game = new Game();
 export const penaltyController = new PenaltyController();
 
 
diff --git a/traque-back/penalty_controller.js b/traque-back/penalty_controller.js
index 88c7f56..54eb31f 100644
--- a/traque-back/penalty_controller.js
+++ b/traque-back/penalty_controller.js
@@ -3,6 +3,7 @@ import { sendUpdatedTeamInformations, teamBroadcast } from "./team_socket.js";
 import { GameState } from "./game.js";
 import { secureAdminBroadcast } from "./admin_socket.js";
 import { game } from "./index.js";
+import { isInZone } from "./zone_manager.js";
 
 export class PenaltyController {
     constructor() {
@@ -91,10 +92,10 @@ export class PenaltyController {
         this.game.teams.forEach((team) => {
             if (team.captured) { return }
             //All the informations are not ready yet
-            if (team.currentLocation == null || this.game.zone.currentZone == null) {
+            if (team.currentLocation == null) {
                 return;
             }
-            if (!isInCircle({ lat: team.currentLocation[0], lng: team.currentLocation[1] }, this.game.zone.currentZone.center, this.game.zone.currentZone.radius)) {
+            if (!isInZone(team.currentLocation)) {
                 //The team was not previously out of the zone
                 if (!this.outOfBoundsSince[team.id]) {
                     this.outOfBoundsSince[team.id] = new Date();
diff --git a/traque-back/team_socket.js b/traque-back/team_socket.js
index 23dbddf..5eeb3ac 100644
--- a/traque-back/team_socket.js
+++ b/traque-back/team_socket.js
@@ -1,5 +1,6 @@
 import { secureAdminBroadcast } from "./admin_socket.js";
 import { io, game } from "./index.js";
+import { currentZone } from "./zone_manager.js";
 
 /**
  * Send a socket message to all the players of a team
@@ -8,9 +9,13 @@ import { io, game } from "./index.js";
  * @param {*} data The payload
  */
 export function teamBroadcast(teamId, event, data) {
+    if(!game.getTeam(teamId)) {
+        return false;
+    }
     for (let socketId of game.getTeam(teamId).sockets) {
         io.of("player").to(socketId).emit(event, data)
     }
+    return true;
 }
 
 /**
@@ -79,11 +84,7 @@ export function initTeamSocket() {
             socket.emit("login_response", true);
             socket.emit("game_state", game.state)
             socket.emit("game_settings", game.settings)
-            socket.emit("zone", game.zone.currentZone)
-            socket.emit("new_zone", {
-                begin: game.zone.currentStartZone,
-                end: game.zone.nextZone
-            })
+            socket.emit("zone", currentZone)
         });
 
         socket.on("logout", () => {
diff --git a/traque-back/zone_manager.js b/traque-back/zone_manager.js
index 31cdb91..fa49c79 100644
--- a/traque-back/zone_manager.js
+++ b/traque-back/zone_manager.js
@@ -1,199 +1,108 @@
-import { randomCirclePoint } from 'random-location'
-import { isInCircle } from './map_utils.js';
-import { map } from './util.js';
+import { playersBroadcast, teamBroadcast } from './team_socket.js';
+import { secureAdminBroadcast } from './admin_socket.js';
 
-export class ZoneManager {
-    constructor(onZoneUpdate, onNextZoneUpdate) {
-        //Setings storing where the zone will start, end and how it should evolve
-        //The zone will start by staying at its mzx value for reductionInterval minutes
-        //and then reduce during reductionDuration minutes, then wait again...
-        //The reduction factor is such that after reductionCount the zone will be the min zone
-        //a call to onZoneUpdate will be made every updateIntervalSeconds when the zone is changing
-        //a call to onNextZoneUpdate will be made when the zone reduction ends and a new next zone is announced
-        this.zoneSettings = {
-            min: { center: null, radius: null },
-            max: { center: null, radius: null },
-            reductionCount: 2,
-            reductionDuration: 1,
-            reductionInterval: 1,
-            updateIntervalSeconds: 1,
+export let currentZone = []
+let tileSize = 16;
+
+export class TileNumber {
+    constructor(x, y) {
+        this.x = x;
+        this.y = y;
+        this.removeDate = null;
+    }
+    equals(other) {
+        return this.x === other.x && this.y === other.y;
+    }
+
+    removeIn(minutes) {
+        this.removeDate = Date.now() + 1000 * 60 * minutes
+    }
+}
+
+export function latLngToTileNumber(pos, tileSize) {
+    const numTilesX = 2 ** tileSize;
+    const numTilesY = 2 ** tileSize;
+    const lngDegrees = pos[1];
+    const latRadians = pos[0] * (Math.PI / 180);
+    return {
+        x:Math.round(numTilesX * ((lngDegrees + 180) / 360)),
+        y:Math.round(numTilesY * (1 - Math.log(Math.tan(latRadians) + 1 / Math.cos(latRadians)) / Math.PI) / 2)
+    };
+}
+
+export function broadcastZoneState() {
+    playersBroadcast("zone", currentZone);
+    secureAdminBroadcast("zone", currentZone);
+}
+
+
+/**
+ * Remove all tiles from the zone
+ */
+export function resetZone() {
+    currentZone = [];
+    broadcastZoneState();
+}
+
+export function setTileSize(size) {
+    resetZone();
+    tileSize = size;
+}
+
+/**
+ * Check whether a position is in the zone
+ * @param {Object} position The position to check
+ */
+export function isInZone(position) {
+    let tile = latLngToTileNumber(position, tileSize);
+    return currentZone.some(square => square.equals(tile))
+}
+
+/**
+ * Initialize a zone with a list of tiles
+ * @param {Array} zone Array of tiles to add
+ */
+export function initZone(zone) {
+    currentZone = [];
+    try {
+        for (let { x, y } of zone) {
+            currentZone.push(new TileNumber(x, y))
         }
-        this.nextZoneDecrement = null;
-        //Live location of the zone
-        this.currentZone = { center: null, radius: null };
-
-        //If the zone is shrinking, this is the target of the current shrinking
-        //If the zone is not shrinking, this will be the target of the next shrinking
-        this.nextZone = { center: null, radius: null };
-
-        //Zone at the begining of the shrinking
-        this.currentStartZone = { center: null, radius: null };
-
-        this.startDate = null;
-        this.started = false;
-        this.updateIntervalId = null;
-        this.nextZoneTimeoutId = null;
-
-        this.onZoneUpdate = onZoneUpdate;
-        this.onNextZoneUpdate = onNextZoneUpdate
+        broadcastZoneState();
+    } catch (e) {
+        console.error(e);
+        secureAdminBroadcast("error", "Invalid zone format")
     }
+}
 
-    /**
-     * Test if a given configuration object is valid, i.e if all needed values are well defined
-     * @param {Object} settings Settings object describing a config of a zone manager
-     * @returns if the config is correct
-     */
-    validateSettings(settings) {
-        if (settings.reductionCount && (typeof settings.reductionCount != "number" || settings.reductionCount <= 0)) { return false }
-        if (settings.reductionDuration && (typeof settings.reductionDuration != "number" || settings.reductionDuration < 0)) { return false }
-        if (settings.reductionInterval && (typeof settings.reductionInterval != "number" || settings.reductionInterval < 0)) { return false }
-        if (settings.updateIntervalSeconds && (typeof settings.updateIntervalSeconds != "number" || settings.updateIntervalSeconds <= 0)) { return false }
-        if (settings.max && (typeof settings.max.radius != "number" || typeof settings.max.center.lat != "number" || typeof settings.max.center.lng != "number")) { return false }
-        if (settings.min && (typeof settings.min.radius != "number" || typeof settings.min.center.lat != "number" || typeof settings.min.center.lng != "number")) { return false }
-        return true;
-    }
-    /**
-     *  Test if the zone manager is ready to start 
-     * @returns true if the zone manager is ready to be started, false otherwise
-     */
-    ready() {
-        return this.validateSettings(this.zoneSettings);
-    }
-
-    /**
-     * Update the settings of the zone, this can be done by passing an object containing the settings to change.
-     * Unless specified, the durations are in minutes
-     * Default config :
-     * `this.zoneSettings = {
-     *      min: {center: null, radius: null},
-     *      max: {center: null, radius: null},
-     *      reductionCount: 2,
-     *      reductionDuration: 10,
-     *      reductionInterval: 10,
-     *      updateIntervalSeconds: 10,
-     *  }`
-     * @param {Object} newSettings The fields of the settings to udpate
-     * @returns 
-     */
-    udpateSettings(newSettings) {
-        //validate settings
-        this.zoneSettings = { ...this.zoneSettings, ...newSettings };
-        this.nextZoneDecrement = (this.zoneSettings.max.radius - this.zoneSettings.min.radius) / this.zoneSettings.reductionCount;
-        return true;
-    }
-
-    /**
-     * Reinitialize the object and stop all the tasks
-     */
-    reset() {
-        this.currentZoneCount = 0;
-        this.started = false;
-        if (this.updateIntervalId != null) {
-            clearInterval(this.updateIntervalId);
-            this.updateIntervalId = null;
-        }
-        if (this.nextZoneTimeoutId != null) {
-            clearTimeout(this.nextZoneTimeoutId);
-            this.nextZoneTimeoutId = null;
-        }
-    }
-
-    /**
-     * Start the zone reduction sequence
-    */
-    start() {
-        this.started = true;
-        this.startDate = new Date();
-        //initialize the zone to its max value
-        this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
-        this.currentStartZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
-        this.currentZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
-        return this.setNextZone();
-
-    }
-
-    /**
-     * Get the center of the next zone, this center need to satisfy two properties
-     * - it needs to be included in the current zone, this means that this new point should lie in the circle of center currentZone.center and radius currentZone.radius - newRadius
-     * - it needs to include the last zone, which means that the center must lie in the center of center min.center and of radius newRadius - min.radius 
-     * @param newRadius the radius that the new zone will have
-     * @returns the coordinates of the new center as an object with lat and long fields
-     */
-    getRandomNextCenter(newRadius) {
-        let ok = false;
-        let res = null
-        let tries = 0;
-        const MAX_TRIES = 100000
-        //take a random point satisfying both conditions
-        while (tries++ < MAX_TRIES && !ok) {
-            res = randomCirclePoint({ latitude: this.currentZone.center.lat, longitude: this.currentZone.center.lng }, this.currentZone.radius - newRadius);
-            ok = (isInCircle({ lat: res.latitude, lng: res.longitude }, this.zoneSettings.min.center, newRadius - this.zoneSettings.min.radius))
-        }
-        if(tries>=MAX_TRIES) {
-            return false;
-        }
-        return {
-            lat: res.latitude,
-            lng: res.longitude
-        }
-    }
-
-    /**
-     * Compute the next zone satifying the given settings, update the nextZone and currentStartZone
-     * Wait for the appropriate duration before starting a new zone reduction if needed
-     */
-    setNextZone() {
-        //At this point, nextZone == currentZone, we need to update the next zone, the raidus decrement, and start a timer before the next shrink
-        //last zone
-        if (this.currentZoneCount == this.zoneSettings.reductionCount) {
-            this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
-            this.currentStartZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
-        } else if (this.currentZoneCount == this.zoneSettings.reductionCount - 1) {
-            this.currentStartZone = JSON.parse(JSON.stringify(this.currentZone))
-            this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
-            this.nextZoneTimeoutId = setTimeout(() => this.startShrinking(), 1000 * 60 * this.zoneSettings.reductionInterval)
-            this.currentZoneCount++;
-        } else if (this.currentZoneCount < this.zoneSettings.reductionCount) {
-            this.nextZone.center = this.getRandomNextCenter(this.nextZone.radius - this.nextZoneDecrement)
-            //Next center cannot be found
-            if(this.nextZone.center === false) {
-                console.log("no center")
-                return false;
+/**
+ * Put a list of tiles in a warning state for a certain amount of time, before removing them
+ * @param {Array} zone Array of tiles to remove
+ * @param {Number} time Time before those tiles get removed in minutes
+ */
+export function removeZone(zone, time) {
+    for (let tile of zone) {
+        for (let currentTile of currentZone) {
+            if (currentTile.equals(tile)) {
+                currentTile.removeIn(time);
             }
-            this.nextZone.radius -= this.nextZoneDecrement;
-            this.currentStartZone = JSON.parse(JSON.stringify(this.currentZone))
-            this.nextZoneTimeoutId = setTimeout(() => this.startShrinking(), 1000 * 60 * this.zoneSettings.reductionInterval)
-            this.currentZoneCount++;
         }
-        this.onZoneUpdate(JSON.parse(JSON.stringify(this.currentStartZone)))
-        this.onNextZoneUpdate({
-            begin: JSON.parse(JSON.stringify(this.currentStartZone)),
-            end: JSON.parse(JSON.stringify(this.nextZone))
-        })
-        return true;
+    }
+    broadcastZoneState();
+}
+
+setInterval(() => {
+    let changed = false;
+    currentZone = currentZone.map(square => {
+        if (square.removeDate !== null && square.removeDate < Date.now()) {
+            changed = true;
+            return null;
+        }
+        return square;
+    }).filter(square => square !== null)
+    if (changed) {
+        broadcastZoneState();
     }
 
-    /*
-     * Start a task that will run periodically updatinng the zone size, and calling the onZoneUpdate callback
-     * This will also periodically check if the reduction is over or not
-     * If the reduction is over this function will call setNextZone
-     */
-    startShrinking() {
-        const startTime = new Date();
-        this.updateIntervalId = setInterval(() => {
-            const completed = ((new Date() - startTime) / (1000 * 60)) / this.zoneSettings.reductionDuration;
-            this.currentZone.radius = map(completed, 0, 1, this.currentStartZone.radius, this.nextZone.radius)
-            this.currentZone.center.lat = map(completed,0,1, this.currentStartZone.center.lat, this.nextZone.center.lat)
-            this.currentZone.center.lng = map(completed,0,1, this.currentStartZone.center.lng, this.nextZone.center.lng)
-            this.onZoneUpdate(JSON.parse(JSON.stringify(this.currentZone)))
-            //Zone shrinking is over
-            if (completed >= 1) {
-                clearInterval(this.updateIntervalId);
-                this.updateIntervalId = null;
-                this.setNextZone();
-                return;
-            }
-        }, this.zoneSettings.updateIntervalSeconds * 1000);
-    }
+}, 1000);
 
-}
\ No newline at end of file