Play Hardest Genius Online Game. One of many Brain Games to play online on your web browser for free at KBH Games. Tagged as Brain Games, Genius Games, Memory Games, and Puzzle Games. Hardest Genius Game App is also available for your iPhone and iPad on the Apple App Store. Upvoted by 18 players. Other games you might like are Genius Simon and Jimmy Neutron: Boy Genius. No download or installation needed to play this free game. Hope this game brings a little joy into your daily life.