Jump Dunk is a casual, skill-based, stickman game that features basketball-style shooting performed on obstacle courses in different settings. A player must use every bit of hand-eye coordination and spatial awareness that they possess along with at least a basic understanding of physics to skillfully shoot basketball balls into red beer-pong, party cups that contain water.
The player's main goal is to complete the challenges they receive in each level as quickly as possible so that they achieve the top championship tier on a winners' podium and progress to the next level. The player must time their shots carefully. If they attempt to dunk a ball too soon when their stickman's body bounces into the air on the trampoline, the ball might fall short of the cup. If they wait too long and shoot high into the bounce, then the ball might fly past the cup entirely.
The game also makes the player face increasingly difficult obstacles on their own and while competing against others. They must figure out how to sink shots into cups stacked too high on blocks. They must deal with swinging hanging cups and platforms that move up and down to prevent access to one or more cups. When competing against others, they sometimes risk one or more of their competitor's cups swinging to their side of the game field, which adds to their work.