Easier
Exit 8 level
This level's resolution method was too difficult to recognize, so it was modified.
The location of the trigger that opens the door in 'exit 8' level has been moved to the front of the corner.
Additionally, a sound was added when the trigger was activated so that it could be clearly recognized.
I apologize for any inconvenience caused.
Other anomalies
Hints were added and reinforced for anomalies that had a low detection probability.
Bug fix
Bug where oxygen does not decrease
Fixed a bug where oxygen did not decrease after going up the stairs in exit 8 level.
Add Achievements
Added 2 secret achievements.
I hope it brings comfort to some and laughter to others...