Four Keys
Using four keys to unlock boxes.
| Category | Price | Seller | Device |
|---|---|---|---|
| Games | Free | Sungwon Jeong | iPhone, iPad, iPod |
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.
