The game is pretty similar to the film "Cube", where a group of people are in a room and under, above, before, behind and besides them are other rooms, all separated by a door. In some of the rooms are traps, to check a room for a trap you have to throw one of your shoes in the room. As the shoe is lost once you've thrown it in a room with a trap you can only check two rooms with traps (you have only two shoes), if there are still other traps you have to find another way to check them.

The menu is a bit confusing, for example you can adjust the mouse sensitivity not under controls but under "General", where you can also change the language (currently is only english availabe).

In Singleplayer you play - surprise, surprise - alone, you also have only two shoes to check traps with.

In Multiplayer you can play as a team - with this you can stay all together or spread out, but if you do so you'll get lost for sure so better stay together ;-)
You have more shoes to check the rooms for traps ofc (every person has two)

On difficulty hard are more traps than on easy but it's not like a trap coming suddenly killing you, you just need a bit more time to go through the rooms that's all.

The game is currently Early Access, you can also see this on some points, but right now it's still worth a try.