0. Reorganized mouse operation feel and increased sensitivity to ease movement - The existing mouse movement was not smooth as it was not frame-by-frame, so this was changed. - The sensitivity of opening the door with the wheel was too low, so increase the sensitivity. 1. Intro reorganization - Supplement to the existing intro narrative 2. Increased residence time after the evil monster’s tour - Difficulty is increased by increasing the difficulty from easy to 2 to 3 seconds with a short stay time of 1 second. 3. Add background sound 4. Add music object 5. Changed the field of view to make it difficult to play in hard mode. 6. Correct errors in time recording 7. Add credit menu 8. Add version information 9. Add goal notification for next progress 10. Library event difficulty adjustment 11. Vault event difficulty adjustment