Play Dino Rex Online Game. One of many Reaction time Games to play online on your web browser for free at KBH Games. Dino Rex is made using Unity technology. Tagged as Arcade Games, Avoid Games, Reaction Time Games, and Run Games. Upvoted by 45 players. Other games you might like are Dino Spin and L.A. Rex. No download or installation needed to play this free game. Hope this game brings a little joy into your daily life.