Practical intro
	part-1-rules-playdemo-and-starting-solver

	part-2-utilizing-solved-game
		Solver completes. 
		Shows how game can be autoplayed. 
		Shows how solution positions can be browsed for research.

	part-3-skin-change-and-editing-game
		Changes game skin to "abstract" skin.
		Shows where game rules or maps can be changed.

 A bit of theory and math:
 	Definition
 	Game difficulty practical metrics 

 Implementations of concept:
	Scroll to section "Imagine" and to "Sandbox Games".
	whirly_and_sokoban.htm

 How albums and game-maps are structured:
	guest_readme.htm#components
	
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