diff --git a/script.js b/script.js
new file mode 100644
index 0000000..eb5ad66
--- /dev/null
+++ b/script.js
@@ -0,0 +1,276 @@
+// Define what kind of tiles exist
+class Square {
+  static Wall = new Square('Wall');
+  static Floor = new Square('Floor');
+  static Player = new Square('Player');
+  static Box = new Square('Box');
+  static Destination = new Square('Destination');
+  static PlayerOnDestination = new Square('PlayerOnDestination');
+  static BoxOnDestination = new Square('BoxOnDestination');
+
+  constructor(name) {
+    this.name = name;
+  }
+}
+
+class CanMove {
+  static Yes = new CanMove('Yes');
+  static No = new CanMove('No');
+  static Maybe = new CanMove('Maybe');
+
+  constructor(name) {
+    this.name = name;
+  }
+}
+
+const movePosition = (position, direction) => {
+
+}
+
+const images = {
+  wall: 'wall.png',
+  floor: 'floor.png',
+  player: 'player.png',
+  box: 'box.png',
+  destination: 'destination.png',
+  empty: 'empty.png',
+};
+
+// Blueprint for the first level
+const level1Blueprint = [[ Square.Wall, Square.Wall, Square.Wall, Square.Wall, Square.Wall, Square.Wall ],
+                         [ Square.Wall, Square.Destination, Square.Box, Square.Floor, Square.Player, Square.Wall ],
+                         [ Square.Wall, Square.Wall, Square.Wall, Square.Wall, Square.Wall, Square.Wall ]];
+
+// define where the player can move
+class MoveDirection {
+  static Right = new MoveDirection('Right');
+  static Left = new MoveDirection('Left');
+  static Up = new MoveDirection('Up');
+  static Down = new MoveDirection('Down');
+
+  constructor(name) {
+    this.name = name;
+  }
+}
+
+class Position {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+  move(direction) {
+    switch (direction) {
+      case MoveDirection.Right:
+        this.x++;
+        break;
+      case MoveDirection.Left:
+        this.x--;
+        break;
+      case MoveDirection.Up:
+        this.y--;
+        break;
+      case MoveDirection.Down:
+        this.y++;
+        break;
+    }
+  }
+  moveBackwards(direction) {
+    switch (direction) {
+      case MoveDirection.Right:
+        this.x--;
+        break;
+      case MoveDirection.Left:
+        this.x++;
+        break;
+      case MoveDirection.Up:
+        this.y++;
+        break;
+      case MoveDirection.Down:
+        this.y--;
+        break;
+    }
+  }
+
+  isWithin(pos) {
+    return this.x < pos.x && this.y < pos.y
+  }
+}
+
+class Tile {
+  constructor(x, y, width, height) {
+    this.x = x;
+    this.y = y;
+    this.width = width;
+    this.height = height;
+    this.canMove = CanMove.No;
+  }
+
+  isMovable() {
+    return this.canMove;
+  }
+}
+
+class ForegroundTile extends Tile{
+  constructor(square, x, y, width, height) {
+    super(x, y, width, height)
+    switch(square) {
+      case Square.Wall:
+        this.image = images.empty;
+        this.canMove = CanMove.Yes;
+        break;
+      case Square.Floor:
+        this.image = images.empty;
+        this.canMove = CanMove.Yes;
+        break;
+      case Square.Player:
+        this.image = images.player;
+        this.canMove = CanMove.Maybe;
+        break;
+      case Square.Box:
+        this.image = images.box;
+        this.canMove = CanMove.Maybe;
+        break;
+      case Square.Destination:
+        this.image = images.empty;
+        this.canMove = CanMove.Yes;
+        break;
+      case Square.PlayerOnDestination:
+        this.image = images.player;
+        this.canMove = CanMove.Maybe;
+        break;
+      case Square.BoxOnDestination:
+        this.image = images.box;
+        this.canMove = CanMove.Maybe;
+        break;
+    }
+  }
+}
+
+class BackgroundTile extends Tile{
+  constructor(square, x, y, width, height) {
+    super(x, y, width, height)
+    switch(square) {
+      case Square.Wall:
+        this.image = images.wall;
+        break;
+      case Square.Floor:
+        this.image = images.floor;
+        break;
+      case Square.Player:
+        this.image = images.floor;
+        break;
+      case Square.Box:
+        this.image = images.floor;
+        break;
+      case Square.Destination:
+        this.image = images.destination;
+        break;
+      case Square.PlayerOnDestination:
+        this.image = images.destination;
+        break;
+      case Square.BoxOnDestination:
+        this.image = images.destination;
+        break;
+    }
+    if (square === Square.Wall) {
+      this.canMove = CanMove.No;
+    } else {
+      this.canMove = CanMove.Yes;
+    }
+  }
+}
+
+// generate a level Object from a blueprint
+const generatePlayground = (levelBlueprint, canvasWidth, canvasHeight) => {
+  let playerExists = false;
+  let background = [];
+  let foreground = [];
+  let boxCount = 0;
+  let destinationCount = 0;
+  const playgroundWidth = levelBlueprint[0].length;
+  const playgroundHeight = levelBlueprint.length;
+  const tileWidth = canvasWidth / playgroundWidth;
+  const tileHeight = canvasHeight / playgroundHeight;
+  let playerPos = {
+    x: NaN,
+    y: NaN,
+  };
+  levelBlueprint.forEach((levelRow, indexRow) => {
+    background.push([]);
+    foreground.push([]);
+    levelRow.forEach((square, indexColumn) => {
+      switch (square) {
+        case Square.Player:
+        case Square.PlayerOnDestination:
+          if (playerExists) {
+            alert("Player already exists.");
+          }
+          playerExists = true;
+          playerPos = new Position(indexColumn, indexRow);
+          break;
+        case Square.Box:
+          boxCount++;
+          break;
+        case Square.Destination:
+          destinationCount++;
+          break;
+        default:
+          break;
+      }
+      foreground[indexRow].push(new ForegroundTile(square, indexColumn * tileWidth, indexRow * tileHeight, tileWidth, tileHeight));
+      background[indexRow].push(new BackgroundTile(square, indexColumn * tileWidth, indexRow * tileHeight, tileWidth, tileHeight));
+    });
+  });
+  if (boxCount != destinationCount) {
+    alert("boxCount != destinationCount")
+  }
+  return {
+    foreground: foreground,
+    background: background,
+    width: playgroundWidth,
+    height: playgroundHeight,
+    playerPos: playerPos,
+    canMove(pos) {
+      const foregroundAnswer = this.foreground[pos.y][pos.x].isMovable();
+      const backgroundAnswer = this.background[pos.y][pos.x].isMovable();
+      if (backgroundAnswer === CanMove.No) {
+        return CanMove.No;
+      } else {
+        return foregroundAnswer;
+      }
+    },
+    move(direction) {
+      let aux = this.playerPos;
+      let willMove = false;
+      let finishedChecking = false;
+      while (aux.isWithin({x: this.width, y: this.height}) && !finishedChecking) {
+        switch(this.canMove(aux)) {
+          case CanMove.Yes:
+            willMove = true;
+            finishedChecking = true;
+            break;
+          case CanMove.No:
+            willMove = false;
+            finishedChecking = true;
+            break;
+          case CanMove.Maybe:
+            aux.move(direction);
+            break;
+        }
+      }
+      if (willMove) {
+        console.log("in playground.move");
+        let posOfObjectToMove = aux;
+        while (aux != this.playerPos) {
+          posOfObjectToMove.moveBackwards(direction);
+          console.log("I try to move");
+          [this.foreground[aux.y][aux.x], this.foreground[posOfObjectToMove.y][posOfObjectToMove.x]] =
+            [this.foreground[posOfObjectToMove.y][posOfObjectToMove.x], this.foreground[aux.y][aux.x]];
+          aux.moveBackwards(direction);
+        }
+      }
+    }
+  };
+}
+
+let playground = generatePlayground(level1Blueprint, 500, 500);