21

21是一種上癮的益智小遊戲，只需添加和達到的目標。

21 is an addictive puzzle game, just add up and achieve the goal.

How it works:

Adding up the numbers, you must meet or exceed the number on the smallest box. This is your goal.

The units can be add up between them. 2 + 5 = 7, but can not be add up to the tens. 2 + 17 = Null

Hundreds can be add up between them. 101 + 120 = 221

The Star (wildcard) can be add up to any number.

The tens can only be add up between them, if start with the same number. 12 + 13 = 25 but 12 + 23 = Null

For new game, press box points (upper box).

Improve your record. You will not be able to stop playing!!!

Permissions:

READ_PHONE_STATE: required by advertising SDK.

Icons by : LazyCrazy - lazycrazy.deviantart.com