Citadel

Citadel is a multiplayer survival game with rogue-like elements inspired by “Cube” the movie.
The game created by a little indie developers team. 

Become a prisoner of the Citadel - you will discover a hardcore gameplay full of pain 

Earn your freedom – each level is a randomly generated labyrinth filled with unique challenges, enemies and traps, and you only have a short period of time to find the exit 

Become stronger – collect Synergy, which acts both as a health and a valuable resource which is needed for activation of portals and unlocking new abilities 

Seek for allies – on each level you can meet other random players, who you can discover new places and overcome tough challenges with (the only way of communication here is the voice chat)