If you liked this
Games like Jack 3 the Future
If you finished Jack 3 the Future, the closest matches are Bebder Game: Bebder Than the Rest, Sludge & Sorcery, I Came Here to Win, Alice's Moo-vie night and El Litri en Busca del Odrogoban Perdido. All 10 share its role-playing (rpg) genre and are ranked by how closely their themes and modes overlap.
