Super Mario Advance 4 - Super Mario Bros. 3 - World 4-Fortress 1

If you look away from a candle, the flame will walk towards you. There are also Thwomps that will move from their openings if you get close to them. Go down the middle pipe and you’ll find some ? Blocks. Hit invisible blocks then use the pipe to go back to the castle. Continue ahead and you’ll battle Boom Boom. Stomp Boom Boom 3 times for the ? Ball so you can finish.