Shoot for fun and it vibrates.
Make it more serious by adding Bullet Recreational Effect Technology. Remember every right shot delivers you a pain. Plan before you act (member only)
Make it even more intense by playing in smoked up arena and wearing tactical gas mask (Elite Members only)
Mission Based Scenario
Green Card is for Headshot, Noob and Pro Package
Green Card + Yellow Card is for Legend Package
Blue Card is for members only