Before you immediately check the answer on this guide, please read this general advice:
0. After getting an ending, be sure to load from your Auto-Save to avoid losing progress
1. Before you check the answer, ask yourself this: would you have more fun if you solved it yourself? If so, then continue trying.
2. If you're stuck and want to solve it yourself, try putting in wrong answers- usually the game will give you hints after a few tries.
3. If you're in Escape seconds, try inspecting items in hand multiple times for hints, espsecially on lower difficulties.
4. Don't be afraid to restart or lower the difficulty; gauge your own fun. If you're getting frustrated, give yourself more time in-game and out.
5. Somnia are designed so that every "wrong" option you pick gives you funny dialogue, a hint forward, and some character knowledge.
6. Please do not read ahead of the section you are in-game; I did my best to limit spoilers, but I can't entirely stop them.