The bearded guys you rescue in Metal Slug also have representation on the cover (he's in between Mega Man and the one-eyed monster from Monster Rancher). If you wanna get technical, Mr. Do and Bub from Puzzle Bobble are on the cover and they have Neo games
Sonic and Pac-Man had games on the Neo Pocket as well
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The Geese sprite looks HIDEOUS on the cover too. I'm wondering where they ripped it from...the Game Gear version of Fatal Fury? spock
Awesome cover overall though multi_co