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Metal Slug 2001 is a pirate game for the Game Boy Color released in 2001, based on Metal Slug 1st Mission with some aspects from the sequel. The character starts with Gimlet, the levels are similar to 1st Mission. There are different bosses based on the original arcade game. The music is similar to several Mega Man games. Two versions exist; an incomplete ROM without the ending, less levels and bosses; and a full game with double the amount of levels, more bosses and an ending.