Nintendo Switch Online gets a surprising sequel to an arcade classic and the first game in a long-running Nintendo series, both free to play now with a subscription.

Nintendo’s Switch Online retro library just inducted two more cult-favorites from the Game Boy. Mario’s Picross and Donkey Kong, commonly referred to as Donkey Kong ‘94, joined the subscription service overnight. That probably doesn’t mean anything to most people but you’d be wise to pay attention.

Nintendo has announced two new retro games for Nintendo Switch Online, and one might be another hint as to the next 3D Super Mario.