Jimmy Neutron the Earth Genius Hedgehog (1991 video game) (ジミー中性子の地球天才ヘッジホッグ ) is the first title of Jimmy Neuton the Earth Genius Hedgehog series, and the third appearance of Jimmy Neutron. the game's original programmer was former Jimmy Team leader and series creator Yuji Naka, and the planner was Hirokazu Yasuhara. The gameplay was faster than any other game before it and amazed many people at launch. This was due to the Mega Drive's Motorola 68000 processor, whose basic speed and ability to handle 16-bit numbers gave it incredible speed compared to its predecessor, the Master System. Nevertheless, a separate 8-bit version, which focused more on exploration than speed, was later released for said system.