Are you having trouble , or are you stuck at a specific puzzle inside the game?
: Use the code 1-5-8-0 to open the safe in Apartment 16. Walkthrough Resources
For a complete visual guide, you can refer to the Eternal Evil 100% Platinum Walkthrough or the Full Gameplay Walkthrough on Steam which includes all puzzles and endings.
: Use the Space Bar to toggle the laser sight on and off for better accuracy. Puzzle Solutions