In Manaic you play as a crazed killer working your way through the corrupt and evil of the city. Though due to your lack of sanity the line of what counts as corrupt and evil can be very subjective.

The goal of the game is to kill the evil that drove you to this insanity and (hopefully) return to some semblance of normality where the murder of others no longer seems the best option out. If at you are caught during your murder spree through the city you will be sent off to an asylum where you will degenerate further as you are driven further into insanity by the knowledge that you have failed to kill the evil.

As the main aspects of the game are to stealthily kill those who have committed evil acts and escape undetected. However due to the fact you are unstable (and you cant spell slaughter without laughter) as you approach your targets there is an increasing chance of the character breaking into manic laughter.

Image Source: http://fanthefiremagazine.com/wp-content/uploads/2013/03/Maniac-Elijah-Wood1.jpg