Fixing an issue with the help function that teleports the character to a previous puzzle.
Increase in the time before this function activates, going from 15 to 25 minutes.
Improvement of puzzle number 15 by slightly tilting a wall a few degrees; I noticed that this puzzle had some readability issues for some people.
Improvement of graphic settings management: any graphic preset can be modified directly without going through the 'custom' preset.