Four Keys app for iPhone and iPad

4.4 ( 2464 ratings )

Games Puzzle Entertainment Action
Developer: Sungwon Jeong

Free

Current version: 1.2.3, last update: 7 years ago
First release : 12 Nov 2014
App size: 11.66 Mb

Using four keys to unlock boxes.
And save aliens as many as possible.

[How to play]
1. Tap a key which colour matches with bottom most box.
2. When you unlock every 10th box, you can save aliens.
3. Tap faster, and more aliens will be freed as a reward.