Stack Challenges is a game very similar to Super Stacker 3 which you can also play here on apigame.com. All you have to do is to stack the rectangle blocks on top of each other at the right time. If you can perfectly set the new block on top of the previous one you will be notified that you have perfectly placed it. You need to be decisive and not hesitate to be successful in this game. Because even a slightest dilemma can be hurtful to you. The game starts with your first mouse click and you will start building your tower. How high can your tower reach? Can you reach the stars?