VR Dungeon is a cross-reality local co-op title, that also requires a smartphone to play. In this title, 2 players has to work together on both different platforms at the same time. One will be playing in VR, while the other uses a phone. Both has to work together to solve puzzles to find the treasure, and then escape the dungeon.
Currently it seems only Android phone is compatible with this game. This core of this title was developed by 2 students (Relative Reality Studios) in just under 4 days, as part of the Ars Electronica Festival.
This game supports the HTC Vive and requires room-scale play area.