http://www.gamefaqs.com/gameboy/585673-cosmo-tank
Legitimately one of the best games of all time. It was released about a year after the Game Boy came out, and it absolutely shamed everything else that had been available up to that point. The atmosphere is truly impressive, especially given the hardware limitations, and the gameplay is unlike anything else I've ever seen.
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Hey, you ever coming back?
You kidding? I am Queens Boulevard.