This challenge is pretty basic, but rather fun and interesting. Play Survivor mode on Normal difficulty or higher, but you can only use the random character selector for both reviving and choosing a character. You must attempt to finish the game, but a single game over means you're done. You may change character skins, but only once per world, and if you change one, you must change all of them by the same amount (e.g., if you change from NES Mega Man to GB Mega Man, that's two steps, so you must change the skins of all of the currently alive characters by two steps). This adds a random element to the character skins. Now that some of the skins actually play differently, this could make things interesting. For added enjoyment, you may also turn the map skin to random.