One-way passages

Does not include passages that are part of the overall game progress that deny access to older areas when there's no plot related reason to go there anymore.

These can be paired teleporters where only one is capable of "sending", doors that can only be opened from one side (and don't stay open), hallways or other passages that function the same.

Commonly part of puzzles, especially those where player has limited time/moves to complete the level. Can also occur in some cases as artificial dead end in case player passes through a one-way passage prematurely.