What action-adventure survival video game published by the indie studio Hello Games was combined with "Super Mario Brothers" to create the fangame "No Mario's Sky"?
No Mario's Sky:  The game combined the gameplay mechanics of "Super Mario Bros." and "No Man's Sky". No Man's Sky: No Man's Sky is an action-adventure survival video game developed and published by the indie studio Hello Games for PlayStation 4 and Microsoft Windows.
No Man's Sky