The third puzzle is ready!

The third puzzle (of four) of Compass Rose is ready for you! I can't wait to hear what you think!

v0.5 changelog:

• The third puzzle (of 4)! It's to the south.
• Mousewheel support
• Add "door won't open" sounds
• Flip the second puzzle about the x-axis
• Minor edits to the first (north) puzzle
• A few graphical tweaks