I think a Smash DS game would be pretty simple to do. X + direction would be your tilts. A + direction would be smashes. B + direction would be your specials. Y would would be jump along with double tapping up for tap jump.
Have the game play like Smash 64 except with better defensive option. Spot dodging and power shielding would do wonders for the game.
Add like Mewtwo, Roy, Gannon, Bowser, and Isaac to the roster. Have the characters in sprite form in 3D environments.
Add Final Desitination, Battlefield, Fountain of dreams, Smashville, and Misery Mines to the stage list.
95% of gamers don't know they are noobs, the 5% who do won't be noobs for long
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