Maybe a category where you play the demo version of Portal 1 (Portal: First Slice). Idk, kinda lame but yeah, just an idea.

thanks

Can someone make a demonstration video about it with visualized keybord?

I still don't understand how I should peform it correctly and what are the issues.

This Run is a newer https://www.speedrun.com/de-DE/portal/runs/z580e9nz