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I decided to do this out of boredom. They're giant blocks that pretty much just break when hit. Since my character is always in "big Mario" status, he can break through these blocks by hitting them, like their 16x16 versions. They were inspired by the SMB3 ones. Also, I made a custom timer that counts in minutes, it sits where all other HUD things go in my hack. When the timer reaches 99, however, the play dies, since I highly doubt anyone will take more than 99 minutes to beat these areas. Oh, I probably showed this before, but I also made a Bonus Room tile set. It comes with everything seen in the original SMW tilesets (Well, in my versions), with a bunch of extras like ladders, spikes, etc.
And I didn't show this yet, but I disabled some things of the climbing of the game. You can't pound the nets/climbable walls (Or ladders/vines, etc.), and when you press the jump button, you fall. I mean, as far as I know you can't be holding a ladder, and then suddenly jump as high as you could on ground.