Score 21

This simple game helps you to enhance you memory and calculation speed by adding numbers to make as much 21 as you can. The game has two modes as "Classic Mode" and "Speed Mode".
In Classic Mode, there is no time limit and you can freely play to beat your record. However, you have only 3 lives and you lose one every time you make a number greater than 21. The game is over when you lose all 3 lives.
In Speed Mode, the time is limited to 21 seconds. However, you receive extra 7 seconds by making each 21. The game is over when the timer reaches zero or you lose all 3 lives.
You may find the full instruction of the game from its Main Menu.
More setting options are accessible from Setting menu where you can change the button colors based on your desire.
Good luck and happy play!