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Penpa+ has disabled external scripts so these tricks no longer work on the default Penpa+. I now host my own penpa fork, dangerous-penpa-edit that will not be maintained but allows external scripts. Links on this page will send you to my fork, dangerous-penpa-edit.

This is not a completely vanilla Angle Loop. It uses some Penpa+ hacks.

Note: This puzzle is not solvable on mobile.

Penpa+

Minor hint You have limited vision in this puzzle.
Slightly bigger hint Why are not all borders shown / how can you get more vision?
Giveaway Resize your browser window / move it around.
The Coding Details I was inspired by these multi-browser demos that have been popping up on Twitter/X. Here's the source code! There isn't anything too special here, I have just taken advantage of the window.screenX and window.screenY attributes.