A sequel to Adventure? Yes it appears that Warren was tinkering with a sequel to his smash hit Adventure in his spare time while working at The Learning Company which he founded in 1980 after leaving Atari. It’s unknown if Atari actually ordered a sequel or if Warren was doing this on his own and hoping to sell it to Atari. However since Atari was considering calling "SwordQuest: Earthworld" Adventure II (and "Fireworld" Adventure III) the later scenario sounds more plausible. Either way, this prototype has an air of mystery about it.