Mr Bullet Revenge

The righteous killer John accepted the order from Shangfeng today to sneak into the world's largest gang organization and rescue the kidnapped female doctor Natasha. And destroy the entire gang. John set off without hesitation. Destroy the armed organizations and a group that came after them along the way. Seeing to reach the inside of the gang, an unexpected thing happened...
The number of bullets in each level is limited To destroy all the enemies in the screen you need to use your wisdom Unlock different levels