The Hiding Of Isaac? Updated on 11 April 2021 Modders have discovered a co-op mode hidden in The Binding Of Isaac: Repentance. Just ten days after the game was released (thanks, NME), dataminers discovered the launch command "networktest" hidden in the code, and soon realised that it permitted the game to be played in co-op via the game's debug console. The discovery is particularly interesting given that while there are some workarounds that enable co-operative play, the game is still clearly marked as a singleplayer adventure on Steam. Given it's not been formally revealed to the game-playing public, it should come as no surprise that the mode is a tad unstable. Therefore, brace yourself for weird bugs and glitches if you intend on giving it a go.