Note: When I mean "Big Mario", I mean the mushroom, the fire flower, the cape, the leaf and the propeller. This hasn't been tested with skinny Mario from the Super Mario Bros. 1 theme.

So today, I was bored so I started experimenting with pipes and conveyor belts, where right when Mario left the pipe, it would make him unable to move because of pow blocks and the fact that Mario can't grab objects in the Super Mario Bros. 1 theme, and to my surprise, I accidentally placed a pipe over a conveyor belt that was on the ground and was just curious if it affected anything. Then, I learned that if a conveyor belt on the ground is placed under a pipe, small Mario can't enter it, but big Mario can, and vice versa.

What you'll need

- A pipe
- A conveyor belt

To make a pipe that only Big Mario can access, put a conveyor belt on the ground/the second row of the pipe.
To make a pipe that only Regular Mario can access, put a conveyor belt on the first row of the pipe.