How to operate:
1. mobile phone aimed at the enemy.
2. click on the screen to shoot bullets.
3. long press the screen to open the protective cover, they can avoid all attacks.
4. fingers on the screen and then slide to the right, the bomb.
5. fingers on the screen and then slide to the right, open face detection, detection of how many face, how much blood.
6. fingers quickly draw a pentagram on the screen, release the gorgeous trick can destroy all enemies.