I have been messing with the game genie to find some strange levels, some are actually chaos levels where there is random bits and empty spaces. This is a more normal one, it seems like a mix of different stages, with some glitches. The level just seems odd. I had the swim in air code enabled when I found the level. That is okay 'cause I was able to hit the block on the roof for a mushroom! I am hoping to find some more weird chaos levels on Mario 1! It's one I like to go back to to mess up. Older games are fairly easy to bug out for something strange