Players can recruit and train bizarre creatures—ranging from sentient vending machines to "evil ice cream cones"—to fight alongside them in a Pokémon-esque collection system.
Unlike its linear predecessor, Episode 4 features an open overworld map with secret areas and optional dungeons, roughly doubling the number of maps from Episode 3.
The story picks up immediately after Episode 3, with the world destroyed and the protagonists, Gabe and Tycho, trapped in a surreal dimension called the "Underhell".