Classic Mode is the standard difficulty mode in Smash Hit. A normal amount of obstacles are going to get in your way, and there are a normal amount of crystals, making it not easy, but not hard to get to Endless Mode. This means that this is a bit harder than Training Mode, but easier than Mayhem Mode.
Classic Mode is the only game mode that does not need Premium Version to play.
Classic Mode is one of the three modes to have checkpoints.