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If you thought Tengen's NES attempt was rare, have a look at this Mega Drive version. Though it was licensed by Tengen (a.k.a. Atari), the majority of this port was handled by Sega. And guess what? Nintendo blocked its sales. Copies of this game are supposedly so rare they've been priced up to $16,000 US dollars, but lLuckily, emulation means we can all play it... but you can also see that it's not worth playing.