2. Undertale
Units Sold: 1.7 million
Metacritic Score: 92
Undertale was created to be a parody of role-playing games. Despite that, it is a very in-depth RPG on its own, gathering critical acclaim for its play on mainstream video games. In the game, you control a human child that’s trapped in a region filled with monsters that are not entirely bad. Undertale has won numerous Game of the Year awards from various publications.