You just got a copy of Godzilla: Monster of Monsters. An NES game released in 1988. You booted up your old NES system and plugged in the controller. You put the cartridge in and felt a wave of nostalgia. After beating the first world, Earth, you got to Mars. But you noticed something strange. Godzilla’s sprite was purple instead of blue. And he moved much slower than before. You continue playing until you get to the next world, Jupiter. Godzilla was gone, you could only play as Mothra.