In Chapter 4 of Deltarune, players control Kris, who encounters a locked door, a step stool, and a green book. The intended solution involves using the step stool to reach the book and activate a switch, but players cannot interact with the stool. Instead, Ralsei acts as a step stool, allowing Suzie to hit the switch. The game features turn-based combat combined with bullet hell mechanics, encouraging creative, pacifist solutions. Emotional responses from enemies vary based on player actions. Notable moments include a turtle shouting at enemies and a battle that transforms into a roulette-style game. Humor subverts RPG conventions, such as a water cooler becoming an enemy and a game show hosted by a character with a CRT TV head. Players can design their hero, but the narrator humorously reminds them that they cannot fully project themselves onto Kris. The game consistently surprises players with its inventive mechanics and narrative twists.