According to http://wiki.answers.com/Q/How_do_you_unlock_all_characters_Super_Smash_Bros_flash, based on the voters review, these are the ways to unlock the characters on Super Smash Flash: Luigi - Clear Adventure on at least normal with Mario Jiggly puff - Clear Adventure on any difficulty with any character. Cloud - Complete 100-man melee with any character. Crono - Clear 3-minute Melee. Naruto - Clear Adventure with the original 13 characters. Shadow - Clear Adventure with Sonic, Tails, and Knuckles Super Sonic - Clear Classic with Sonic on Very Hard Difficulty without getting Game Over. Zero - Clear Adventure with Mega man not getting Game Over on at least Normal Difficulty. Young Link - Clear Classic with Link on any difficulty. Inuyasha - Clear Adventure without losing any lives. Mr. Game and Watch - Clear Target Test with every character but him. Mr. Incredible - Clear Classic Mode with the original 13 characters. Mewtwo - Clear Adventure with Pikachu and Jigglypuff. Lloyd - Clear Adventure with any character after having one hour of total play time. Blue - Clear Adventure with Blade on at least Normal difficulty. Nera-Clear adventure,classic,and 10 100 3 15 minute melee with Super sonic and cloud.