Boring unsypathetic characters doing annoying things. The way this movie presents itself is that the "challenges" are the main component, but they are quick and underwhelming, in between long boring annoying scenes of the main characters doing boring annoying things.
Instead:
If you want gore: Saw
If you want a horror movie about a game, for money: would you rather
Neither of those are perfext movies but are much better than this 2 hour waste of time