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I am trying to modify the p2.js example (http://phaser.io/examples/v2/p2-physics/tilemap). I have added a group named explosions which i want to have it's members to collide with the ship but not with the tilemap. From what i've read in the forum, i need to use the collision groups but i cannot understand how (in this case). Using them for the ship is easy and think that using a loop could be ok for the explosions group but for the tilemap it's not that easy. I have read nearly all posts in this forum but i didn't find anything for this case. Any hint ? function preload() { game.load.tilemap('map', 'assets/tilemaps/maps/collision_test.json', null, Phaser.Tilemap.TILED_JSON); game.load.image('ground_1x1', 'assets/tilemaps/tiles/ground_1x1.png'); game.load.image('walls_1x2', 'assets/tilemaps/tiles/walls_1x2.png'); game.load.image('tiles2', 'assets/tilemaps/tiles/tiles2.png'); game.load.image('ship', 'assets/sprites/player.png'); game.load.atlas('explosion', 'assets/atlas/explosions.png', 'assets/atlas/explosions.json'); } var ship; var map; var layer; var cursors; var result; var tilesCollisionGroup; var shipCollisionGroup; var explosionsCollisionGroup; function create() { game.physics.startSystem(Phaser.Physics.P2JS); tilesCollisionGroup = this.physics.p2.createCollisionGroup(); shipCollisionGroup = this.physics.p2.createCollisionGroup(); explosionsCollisionGroup = this.physics.p2.createCollisionGroup(); explosions = game.add.physicsGroup(Phaser.Physics.P2JS); explosions.createMultiple(5, 'explosion'); // explosions.body.setCollisionGroup(explosionsCollisionGroup); ? // explosions.body.collides([shipCollisionGroup]); ? map = game.add.tilemap('map'); map.addTilesetImage('ground_1x1'); map.addTilesetImage('walls_1x2'); map.addTilesetImage('tiles2'); layer = map.createLayer('Tile Layer 1'); layer.resizeWorld(); map.setCollisionBetween(1, 12); game.physics.p2.convertTilemap(map, layer); // how can i define tilesCollisionGroup ? ship = game.add.sprite(200, 200, 'ship'); game.physics.p2.enable([ship],true); ship.body.clearShapes(); ship.body.loadPolygon('physicsData', 'player'); ship.body.fixedRotation = false; ship.body.setCollisionGroup(shipCollisionGroup); ship.body.collides(tilesCollisionGroup); game.camera.follow(ship); game.physics.p2.setBoundsToWorld(true, true, true, true, false); cursors = game.input.keyboard.createCursorKeys(); game.input.onTap.add(addexplosion, this); }