GNOG is a 2017 puzzle video game developed by KO_OP and published by Double Fine Presents for PlayStation 4 iOS Microsoft Windows and macOS. GNOG was developed by Montreal-based studio KO_OP. Originally titled "GNAH" the title was changed due to a trademark dispute. The game was showcased at the 2014 E3 "Horizon conference". It was shown at E3 2015 with a playable demo. It was released on the PlayStation 4 on May 2 2017 and on iOS on November 28 the same year. Later on July 17 2018 it became available via Steam on Windows and macOS as well.