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+Todo
+====
+- [ ] new game menu
+	- [ ] save/load preferences
+	- [ ] load custom image
+	- [ ] flip panel for more options
+- [ ] highlight hints
+- [ ] art generator
+- [ ] properly align widgets
+- [ ] winning animation
+	- [ ] reflection glare? 
+- [ ] save/load current game
+
+Resources
+---------
+- https://github.com/GDquest/godot-platformer-2d
+- https://tomodachi.fandom.com/wiki/Slide_Puzzle
+
+Image generation
+----------------
+- https://en.wikipedia.org/wiki/Droste_effect
+
+Image collections
+-----------------
+- https://search.creativecommons.org/collections/rawpixel
+- https://www.rawpixel.com/category/53/public-domain
+- https://www.rawpixel.com/category/83/rawpixelcollection
+- https://www.si.edu/collections
+
+Color palette: https://lospec.com/palette-list/slso8