Psycho Hopper is a side-scrolling action game set on the bizarre planetoid Dreams – a luxury vacation spot in the middle of the Belt of Unreality. During the “Season of High Unlikelihood,” you embark on a treasure hunt in a fantasy castle. Bouncing along on a gas-filled bubble and armed with a blunderbuss, you traverse each level from left to right searching for four parts of a valuable artifact. You must avoid or shoot the enemies on screen, as touching them reduces your gas gauge, and once it's empty you lose one of your three lives. The goal is to collect all parts and conquer the perilous dream world.