Nick is Killer is a new type of game that combines elements of detective, adventure, and survival. You play as a killer, trying to escape from an underwater prison. You need to escape from the prison, and the only way to do that is to solve the puzzles that are waiting for you.

The gameplay is based on solving puzzles. You need to find the right solution to each puzzle, so that you can escape from the prison. In order to escape, you need to find the right keys, which will allow you to open the gate.

The main difference between this game and other detective games is that you need to use your detective skills to find the right solution to each puzzle.