Nightmare in SCP is a horror game that takes place in the SCP Foundation, a horror and science fiction universe. The story is about an entity that can change its form and personality, and can also take on the shape of a human being. This is why the game is called a "nightmare in SCP".

The gameplay is very simple. You need to collect all the objects in the game, and the more points you get, the higher the level you can reach. The object is moving in the direction of the switch, and if you are not fast enough, it will catch you and you will lose a part of your health.