Well this is unexpected. Today, Nitrome released Test Subject Arena, the “Test Subject Blue Spin-off” hinted by Mat one day. In Test Subject Arena… there is no single player or plot! In Test Subject Arena, you and a friend fight to see who can obtain the most goo! No computer players, you actually have to have a friend fight with you. Its a mixture of Portal 2 and Metroid Prime 2 Echoes Multiplayer. So, why not give it a go through 14 stages combining hazards and objects from the Test Subject Blue universe? Click to play.
Test Subject Arena