Is there a way to disable jump in walk mode?

My students are making a maze and would like users to not be able to jump over the walls. I told them to put a roof over the maze for now but am wondering if they could disable jump ability if desired. Thanks!

I tried a couple of things and accidentally discovered an easy solution.
Trap the key press, with a when [key] key is [pressed]
You don’t even need the stop transition of [object] block.

Here’s the space

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Awesome! Thank you so much !!!