3 different modes!
1.Survival Mode: There is no time limit! Play as you can find the true one.
2.Challenge Mode: Challenge with time. Be quick. You have only 30 seconds. And be carefull! You don't have chance to select wrong one!
3.Arcade Mode: You have only 3 seconds to find true box at each level. But don't affraid. Even you click wrong one, you still have chance if you have time.