Super Mario Warp Zone
This hack features 15 levels, each with two stars, presented in a scavenger-hunt style. The game does not save progress after each star.
Mod Note: The possible but unintended 100 coin stars will freeze the game in some places unless you find a spot that is safe to spawn+collect the star, where ground pounding produces the normal particle effect. This old bug existed in some hacks because of the level boundary patch & spawning a star outside the normal confines of the level to my knowledge.