Coins are set out orderly and easily reset.
Rationale: Three heads add up to nine. Two heads and one tail add up to eight. One head and two tails add up to seven. Three tails add up to six.
http://hexa.viki.wiki/assets/pages/so-saru-game/play.html HEIGHT 700 Assign 'Heads' a value of 3. Assign 'Tails' a value of 4.
Click on the word 'wiki' where the word appears to activate this page as a calculator. You will see a checkmark to the far right of the ☰ after you have done this.
3H 9 _______ changing Yang 2H1T 8 --- --- Yin 1H2T 7 _______ Yang 3T 6 --- --- changing Yin 3 heads = 6 = a broken line ( ) which changes to a firm line ( ). 3 tails = 9 = a firm line ( ) which changes to a broken line ( ). 2 heads and 1 tail = 7 a firm line ( ) that does not change. 2 tails and 1 head = 8 a broken line ( ) that does not change.
9 firm - broken 7 firm 8 broken 7 firm 6 broken - firm 8 broken
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pages/so-saru-game
Where we've been
The idea of the game is to put coins in 3 × 3 grid with head and tail randomly. After that, a click on a coin flips the clicked coin as well as the ones horizontally or vertically adjacent.
What we've come to value
See Ogiwara Playground. post 
See Lights Out, an electronic game released by Tiger Electronics in 1995. wikipedia
See Idioms for Composing Games with EToys, including lights out in six lines. pdf