Cuphead is a run and gun platform indie video game developed and published by Studio MDHR Entertainment. As the titular character Cuphead, the player fights a series of bosses in order to repay a debt to the devil.
you can beat the bosses on simple to get to the next areas but dice and devil don't have simple mode. also king dice doesn't let you fight the devil till you've done all the levels on regular. (aka claimed all the soul contracts, since you get a soul contract only when you defeat a boss on regular.) however, run and guns are optional too.