Mazestopper Competition is a classic game of who gets to the finish line first. Use the space bar to initiate and pause the game. As you begin to move, so too will your opponent and it's up to you to place obstructions in his way so you can get to the flag first. You cannot block anyone's way entirely, so you're just going to have to make him do more legwork since you have to let him get to the flag. If you freeze the game you can delete obstacles by clicking on the red X on top of the obstacle. When you unfreeze, you can't remove anything. The levels get surprisingly difficult and it takes real strategy to make it through this game.