In Ninja Brainrot Slice, a player navigates a character through a 2D environment. The character can move left or right, and jump to change elevation. Player movement can cause the character to collide with objects or the edges of the screen.
The core mechanic revolves around navigating obstacles and platforms to reach the end of each level. The game requires precise timing for successful jumps, as well as spatial awareness to avoid collisions. Levels increase in difficulty as the player progresses, introducing additional challenges such as moving platforms and destructive objects.
The game runs directly in the browser without the need for downloads or registration. Players must complete each level to progress through the game. The objective is to complete each level in the fastest time possible, although specific completion times are not tracked.