itch.io

That if a code letter is currently open, don't matter where are you now, you can close it. In your solution (box collider) may happen same thing as before. Example:

1. I pressed S button (go backwards)
2. And on last moment I open letter
3. My position got updated (from 1st step)
4. And now I'm outside of collider

It may happen rarely, but I was lucky to see that :)