diff --git a/front/src/Api/Events/IframeEvent.ts b/front/src/Api/Events/IframeEvent.ts
index 613ae525..a0e7717a 100644
--- a/front/src/Api/Events/IframeEvent.ts
+++ b/front/src/Api/Events/IframeEvent.ts
@@ -88,13 +88,11 @@ export type IframeQueryMap = {
     getState: {
         query: undefined,
         answer: GameStateEvent,
-        callback: () => GameStateEvent|PromiseLike<GameStateEvent>
     },
     getMapData: {
         query: undefined,
         answer: MapDataEvent,
-        callback: () => MapDataEvent|PromiseLike<GameStateEvent>
-    }
+    },
 }
 
 export interface IframeQuery<T extends keyof IframeQueryMap> {
diff --git a/front/src/Api/iframe/room.ts b/front/src/Api/iframe/room.ts
index 2e4f9fd5..00d974dc 100644
--- a/front/src/Api/iframe/room.ts
+++ b/front/src/Api/iframe/room.ts
@@ -1,18 +1,12 @@
 import {Observable, Subject} from "rxjs";
 
-import { isMapDataEvent } from "../Events/MapDataEvent";
 import { EnterLeaveEvent, isEnterLeaveEvent } from "../Events/EnterLeaveEvent";
-import { isGameStateEvent } from "../Events/GameStateEvent";
 
 import {IframeApiContribution, queryWorkadventure, sendToWorkadventure} from "./IframeApiContribution";
 import { apiCallback } from "./registeredCallbacks";
-import type {LayerEvent} from "../Events/LayerEvent";
-import type {SetPropertyEvent} from "../Events/setPropertyEvent";
 import {isSetVariableEvent, SetVariableEvent} from "../Events/SetVariableEvent";
 
 import type { ITiledMap } from "../../Phaser/Map/ITiledMap";
-import type { MapDataEvent } from "../Events/MapDataEvent";
-import type { GameStateEvent } from "../Events/GameStateEvent";
 
 const enterStreams: Map<string, Subject<EnterLeaveEvent>> = new Map<string, Subject<EnterLeaveEvent>>();
 const leaveStreams: Map<string, Subject<EnterLeaveEvent>> = new Map<string, Subject<EnterLeaveEvent>>();
@@ -39,6 +33,16 @@ export const setMapURL = (url: string) => {
     mapURL = url;
 }
 
+export const initVariables = (_variables: Map<string, unknown>): void => {
+    for (const [name, value] of _variables.entries()) {
+        // In case the user already decided to put values in the variables (before onInit), let's make sure onInit does not override this.
+        if (!variables.has(name)) {
+            variables.set(name, value);
+        }
+    }
+
+}
+
 setVariableResolvers.subscribe((event) => {
     variables.set(event.key, event.value);
     const subject = variableSubscribers.get(event.key);
diff --git a/front/src/Phaser/Game/GameMap.ts b/front/src/Phaser/Game/GameMap.ts
index a616cf4a..e095dab1 100644
--- a/front/src/Phaser/Game/GameMap.ts
+++ b/front/src/Phaser/Game/GameMap.ts
@@ -1,4 +1,4 @@
-import type { ITiledMap, ITiledMapLayer, ITiledMapLayerProperty } from "../Map/ITiledMap";
+import type { ITiledMap, ITiledMapLayer, ITiledMapProperty } from "../Map/ITiledMap";
 import { flattenGroupLayersMap } from "../Map/LayersFlattener";
 import TilemapLayer = Phaser.Tilemaps.TilemapLayer;
 import { DEPTH_OVERLAY_INDEX } from "./DepthIndexes";
@@ -19,7 +19,7 @@ export class GameMap {
     private callbacks = new Map<string, Array<PropertyChangeCallback>>();
     private tileNameMap = new Map<string, number>();
 
-    private tileSetPropertyMap: { [tile_index: number]: Array<ITiledMapLayerProperty> } = {};
+    private tileSetPropertyMap: { [tile_index: number]: Array<ITiledMapProperty> } = {};
     public readonly flatLayers: ITiledMapLayer[];
     public readonly phaserLayers: TilemapLayer[] = [];
 
@@ -61,7 +61,7 @@ export class GameMap {
         }
     }
 
-    public getPropertiesForIndex(index: number): Array<ITiledMapLayerProperty> {
+    public getPropertiesForIndex(index: number): Array<ITiledMapProperty> {
         if (this.tileSetPropertyMap[index]) {
             return this.tileSetPropertyMap[index];
         }
@@ -151,7 +151,7 @@ export class GameMap {
         return this.map;
     }
 
-    private getTileProperty(index: number): Array<ITiledMapLayerProperty> {
+    private getTileProperty(index: number): Array<ITiledMapProperty> {
         return this.tileSetPropertyMap[index];
     }
 
diff --git a/front/src/Phaser/Game/GameScene.ts b/front/src/Phaser/Game/GameScene.ts
index 1c522703..5d4c6b2b 100644
--- a/front/src/Phaser/Game/GameScene.ts
+++ b/front/src/Phaser/Game/GameScene.ts
@@ -50,7 +50,7 @@ import { SelectCharacterScene, SelectCharacterSceneName } from "../Login/SelectC
 import type {
     ITiledMap,
     ITiledMapLayer,
-    ITiledMapLayerProperty,
+    ITiledMapProperty,
     ITiledMapObject,
     ITiledTileSet,
 } from "../Map/ITiledMap";
@@ -1197,12 +1197,12 @@ ${escapedMessage}
     }
 
     private getProperty(layer: ITiledMapLayer | ITiledMap, name: string): string | boolean | number | undefined {
-        const properties: ITiledMapLayerProperty[] | undefined = layer.properties;
+        const properties: ITiledMapProperty[] | undefined = layer.properties;
         if (!properties) {
             return undefined;
         }
         const obj = properties.find(
-            (property: ITiledMapLayerProperty) => property.name.toLowerCase() === name.toLowerCase()
+            (property: ITiledMapProperty) => property.name.toLowerCase() === name.toLowerCase()
         );
         if (obj === undefined) {
             return undefined;
@@ -1211,12 +1211,12 @@ ${escapedMessage}
     }
 
     private getProperties(layer: ITiledMapLayer | ITiledMap, name: string): (string | number | boolean | undefined)[] {
-        const properties: ITiledMapLayerProperty[] | undefined = layer.properties;
+        const properties: ITiledMapProperty[] | undefined = layer.properties;
         if (!properties) {
             return [];
         }
         return properties
-            .filter((property: ITiledMapLayerProperty) => property.name.toLowerCase() === name.toLowerCase())
+            .filter((property: ITiledMapProperty) => property.name.toLowerCase() === name.toLowerCase())
             .map((property) => property.value);
     }
 
diff --git a/front/src/Phaser/Game/SharedVariablesManager.ts b/front/src/Phaser/Game/SharedVariablesManager.ts
index abd2474e..aeb26d68 100644
--- a/front/src/Phaser/Game/SharedVariablesManager.ts
+++ b/front/src/Phaser/Game/SharedVariablesManager.ts
@@ -5,18 +5,28 @@ import type {RoomConnection} from "../../Connexion/RoomConnection";
 import {iframeListener} from "../../Api/IframeListener";
 import type {Subscription} from "rxjs";
 import type {GameMap} from "./GameMap";
-import type {ITiledMapObject} from "../Map/ITiledMap";
+import type {ITile, ITiledMapObject} from "../Map/ITiledMap";
+import type {Var} from "svelte/types/compiler/interfaces";
+
+interface Variable {
+    defaultValue: unknown
+}
 
 export class SharedVariablesManager {
     private _variables = new Map<string, unknown>();
     private iframeListenerSubscription: Subscription;
-    private variableObjects: Map<string, ITiledMapObject>;
+    private variableObjects: Map<string, Variable>;
 
     constructor(private roomConnection: RoomConnection, private gameMap: GameMap) {
         // We initialize the list of variable object at room start. The objects cannot be edited later
         // (otherwise, this would cause a security issue if the scripting API can edit this list of objects)
         this.variableObjects = SharedVariablesManager.findVariablesInMap(gameMap);
 
+        // Let's initialize default values
+        for (const [name, variableObject] of this.variableObjects.entries()) {
+            this._variables.set(name, variableObject.defaultValue);
+        }
+
         // When a variable is modified from an iFrame
         this.iframeListenerSubscription = iframeListener.setVariableStream.subscribe((event) => {
             const key = event.key;
@@ -33,14 +43,14 @@ export class SharedVariablesManager {
         });
     }
 
-    private static findVariablesInMap(gameMap: GameMap): Map<string, ITiledMapObject> {
-        const objects = new Map<string, ITiledMapObject>();
+    private static findVariablesInMap(gameMap: GameMap): Map<string, Variable> {
+        const objects = new Map<string, Variable>();
         for (const layer of gameMap.getMap().layers) {
             if (layer.type === 'objectgroup') {
                 for (const object of layer.objects) {
                     if (object.type === 'variable') {
                         // We store a copy of the object (to make it immutable)
-                        objects.set(object.name, {...object});
+                        objects.set(object.name, this.iTiledObjectToVariable(object));
                     }
                 }
             }
@@ -48,6 +58,21 @@ export class SharedVariablesManager {
         return objects;
     }
 
+    private static iTiledObjectToVariable(object: ITiledMapObject): Variable {
+        const variable: Variable = {
+            defaultValue: undefined
+        };
+
+        if (object.properties) {
+            for (const property of object.properties) {
+                if (property.name === 'default') {
+                    variable.defaultValue = property.value;
+                }
+            }
+        }
+
+        return variable;
+    }
 
     public close(): void {
         this.iframeListenerSubscription.unsubscribe();
diff --git a/front/src/Phaser/Game/StartPositionCalculator.ts b/front/src/Phaser/Game/StartPositionCalculator.ts
index 7460c81c..a0184d2b 100644
--- a/front/src/Phaser/Game/StartPositionCalculator.ts
+++ b/front/src/Phaser/Game/StartPositionCalculator.ts
@@ -1,5 +1,5 @@
 import type { PositionInterface } from "../../Connexion/ConnexionModels";
-import type { ITiledMap, ITiledMapLayer, ITiledMapLayerProperty, ITiledMapTileLayer } from "../Map/ITiledMap";
+import type { ITiledMap, ITiledMapLayer, ITiledMapProperty, ITiledMapTileLayer } from "../Map/ITiledMap";
 import type { GameMap } from "./GameMap";
 
 const defaultStartLayerName = "start";
@@ -112,12 +112,12 @@ export class StartPositionCalculator {
     }
 
     private getProperty(layer: ITiledMapLayer | ITiledMap, name: string): string | boolean | number | undefined {
-        const properties: ITiledMapLayerProperty[] | undefined = layer.properties;
+        const properties: ITiledMapProperty[] | undefined = layer.properties;
         if (!properties) {
             return undefined;
         }
         const obj = properties.find(
-            (property: ITiledMapLayerProperty) => property.name.toLowerCase() === name.toLowerCase()
+            (property: ITiledMapProperty) => property.name.toLowerCase() === name.toLowerCase()
         );
         if (obj === undefined) {
             return undefined;
diff --git a/front/src/Phaser/Map/ITiledMap.ts b/front/src/Phaser/Map/ITiledMap.ts
index 0653e83a..c5b96f22 100644
--- a/front/src/Phaser/Map/ITiledMap.ts
+++ b/front/src/Phaser/Map/ITiledMap.ts
@@ -16,7 +16,7 @@ export interface ITiledMap {
      * Map orientation (orthogonal)
      */
     orientation: string;
-    properties?: ITiledMapLayerProperty[];
+    properties?: ITiledMapProperty[];
 
     /**
      * Render order (right-down)
@@ -33,7 +33,7 @@ export interface ITiledMap {
     type?: string;
 }
 
-export interface ITiledMapLayerProperty {
+export interface ITiledMapProperty {
     name: string;
     type: string;
     value: string | boolean | number | undefined;
@@ -51,7 +51,7 @@ export interface ITiledMapGroupLayer {
     id?: number;
     name: string;
     opacity: number;
-    properties?: ITiledMapLayerProperty[];
+    properties?: ITiledMapProperty[];
 
     type: "group";
     visible: boolean;
@@ -69,7 +69,7 @@ export interface ITiledMapTileLayer {
     height: number;
     name: string;
     opacity: number;
-    properties?: ITiledMapLayerProperty[];
+    properties?: ITiledMapProperty[];
     encoding?: string;
     compression?: string;
 
@@ -91,7 +91,7 @@ export interface ITiledMapObjectLayer {
     height: number;
     name: string;
     opacity: number;
-    properties?: ITiledMapLayerProperty[];
+    properties?: ITiledMapProperty[];
     encoding?: string;
     compression?: string;
 
@@ -117,7 +117,7 @@ export interface ITiledMapObject {
     gid: number;
     height: number;
     name: string;
-    properties: { [key: string]: string };
+    properties?: ITiledMapProperty[];
     rotation: number;
     type: string;
     visible: boolean;
@@ -163,7 +163,7 @@ export interface ITiledTileSet {
     imagewidth: number;
     margin: number;
     name: string;
-    properties: { [key: string]: string };
+    properties?: ITiledMapProperty[];
     spacing: number;
     tilecount: number;
     tileheight: number;
@@ -182,7 +182,7 @@ export interface ITile {
     id: number;
     type?: string;
 
-    properties?: Array<ITiledMapLayerProperty>;
+    properties?: ITiledMapProperty[];
 }
 
 export interface ITiledMapTerrain {
diff --git a/front/src/iframe_api.ts b/front/src/iframe_api.ts
index ee68270e..fb44738f 100644
--- a/front/src/iframe_api.ts
+++ b/front/src/iframe_api.ts
@@ -11,7 +11,7 @@ import nav from "./Api/iframe/nav";
 import controls from "./Api/iframe/controls";
 import ui from "./Api/iframe/ui";
 import sound from "./Api/iframe/sound";
-import room, {setMapURL, setRoomId} from "./Api/iframe/room";
+import room, {initVariables, setMapURL, setRoomId} from "./Api/iframe/room";
 import player, {setPlayerName, setTags, setUuid} from "./Api/iframe/player";
 import type { ButtonDescriptor } from "./Api/iframe/Ui/ButtonDescriptor";
 import type { Popup } from "./Api/iframe/Ui/Popup";
@@ -29,6 +29,7 @@ const initPromise = new Promise<void>((resolve) => {
         setMapURL(state.mapUrl);
         setTags(state.tags);
         setUuid(state.uuid);
+        initVariables(state.variables as Map<string, unknown>);
         resolve();
     }));
 });
diff --git a/maps/tests/Variables/script.js b/maps/tests/Variables/script.js
index afd16773..cef9818e 100644
--- a/maps/tests/Variables/script.js
+++ b/maps/tests/Variables/script.js
@@ -1,11 +1,13 @@
+WA.onInit().then(() => {
+    console.log('Trying to read variable "doorOpened" whose default property is true. This should display "true".');
+    console.log('doorOpened', WA.room.loadVariable('doorOpened'));
 
-console.log('Trying to set variable "not_exists". This should display an error in the console.')
-WA.room.saveVariable('not_exists', 'foo');
-
-console.log('Trying to set variable "config". This should work.');
-WA.room.saveVariable('config', {'foo': 'bar'});
-
-console.log('Trying to read variable "config". This should display a {"foo": "bar"} object.');
-console.log(WA.room.loadVariable('config'));
+    console.log('Trying to set variable "not_exists". This should display an error in the console.')
+    WA.room.saveVariable('not_exists', 'foo');
 
+    console.log('Trying to set variable "config". This should work.');
+    WA.room.saveVariable('config', {'foo': 'bar'});
 
+    console.log('Trying to read variable "config". This should display a {"foo": "bar"} object.');
+    console.log(WA.room.loadVariable('config'));
+});
diff --git a/maps/tests/Variables/variables.json b/maps/tests/Variables/variables.json
index 93573da8..61067071 100644
--- a/maps/tests/Variables/variables.json
+++ b/maps/tests/Variables/variables.json
@@ -72,6 +72,24 @@
                  "template":"config.tx",
                  "x":57.5,
                  "y":111
+                }, 
+                {
+                 "height":0,
+                 "id":6,
+                 "name":"doorOpened",
+                 "point":true,
+                 "properties":[
+                        {
+                         "name":"default",
+                         "type":"bool",
+                         "value":true
+                        }],
+                 "rotation":0,
+                 "type":"variable",
+                 "visible":true,
+                 "width":0,
+                 "x":131.38069962269,
+                 "y":106.004988169086
                 }],
          "opacity":1,
          "type":"objectgroup",
@@ -80,7 +98,7 @@
          "y":0
         }],
  "nextlayerid":8,
- "nextobjectid":6,
+ "nextobjectid":8,
  "orientation":"orthogonal",
  "properties":[
         {