Maxwell's puzzling demon v1.5.23

[h3]Levels update[/h3]

• Added 0-J.
  
• Changed entering 9-O, entering 0-ι₂ and A-20.
  
• Slightly changed 9-24, 0-16, 0-ν and 0-ξ.
  
• Fixed 0-15?₅ and entering 0-20 to prevent unintended solutions.
  
• Adjusted the difficulty of 4-9?, 0-16?, 0-17?, 0-κ and A-15.
  
• Adjusted the appearance of 3-15?, 9-19, 0-9 and A-53.
  

[h3]Hotfix (v1.5.23a)[/h3]

• Reverted Reaching 0-ι₂ to prevent an unintended sequence breaking.