Mansion At Midnight

This will be available to download on Steam: Mansion At Midnight on Steam (steampowered.com)

Mansion at Midnight is a survival horror game where your friends may not be who they seem. The front doors to the mansion are locked, and you will need to look for weapons and magical items to defend yourself from the evil spirits that dwell inside. Be warned, there is a cursed item hidden among the useful tools, and the unfortunate soul who picks up this cursed item will be transformed into one of five powerful and terrifying creatures. Friends will become foes, and the battle for survival will begin. Who will win, the survivors, or the traitor? Only after the battle is done will the doors to the mansion open again.

There are multiple game modes, Single player, which can be played offline, and online Multiplayer.

Single Player
In single player you will take the role of an investigator named "M" a man who wishes to rid the mansion of evil once and for all.

Multiplayer
Minimum of 3 players, maximum of 6.