No power ups, no stars (from inventory or in levels), no inventory items except for clouds for 7F1 and 8F, no fanfares, no 1 ups, no coins over 99 to not get extra lives. If for example a game over after using cloud in 7F1, it's a reset cause no more than the two dedicated clouds. No wrong warp just so the idea of the challenge run remains, as the end of W7 and W8 are quite challenging.

I think it's time to have Low% in SMB3 too.