That's absolutely an unintended solution and I'll have to think about whether I want to fix it or not - it might be a good thing that it's solvable without doing this: https://imgur.com/a/BIiTJdu. I thought that you can't avoid building this setup, but apparently I gave the player too many walls to place. The other two are very similar to the intended solutions (the same idea, a bit different execution - as expected).