ADD TO Game.js -- update this.physics.arcade.overlap(this.spacerockgroup, this.bunnygroup, this.bunnyCollision, null, this); -- ADD bunnyCollision: function(r, b) { if(b.exists){ this.respawnRock(r); b.kill(); this.totalBunnies--; this.checkBunniesLeft(); } }, checkBunniesLeft: function() { if(this.totalBunnies <= 0){ // GAME OVER } },