Phase is a single-player side-scrolling puzzle platformer. You play as a ghost trapped in the dream world. You can phase through and around obstacles using the "phase bubble", as well as move around and jump. Watch out for spikes! Find the exit door in each level while collecting as many gems and super gems as you can. The more gems you collect, the higher your rank for the level will be. Play through all the levels and escape from the dream and back into reality!