Steins Gate is a clone/remake of the 8-bit sequel to the Steins Gate anime/visual novel. Coded by calc84maniac. Even though it’s a non-canon spin-off, it does contain major spoilers for the original Steins Gate story. It might not make sense unless you’ve watched/played Steins Gate.

http://gbdev.gg8.se/forums/viewtopic.php?id=191