Hmm are the enemies immortal? Because I don't know what I can do with ball shooting. But I can see the enemy approach you by hearing sounds, am I right
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Yes, I should have added some more accurate tutorial than just list of controls... The security are invulnerable. Enemies can hear the sound of the ball hitting anything(your body doesn't make any sounds). They also remember the last point where they saw you and investigate it and stay there forever(until spotting you or hearing the sound). They laugh every time they see you. Have you found the hidden poster? It requires some parkour...