Replay Castle and Fortress levels
To replay Castle and Fortress levels you have already beaten, on the map screen stand Mario over the one you want to replay, hold down L and press R (or vice versa). Mario will enter the level, even though you have already cleared it.
Note - if you die re-playing through any of these levels, you will be forced to start the level from the beginning when you try again, even if you break the halfway-point tape.
More tricks, tips and cheats for this game are right here - Super Mario World cheats
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