So Saru Game

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. The goal is to make all coins show their faces. pdf

Coins are set out orderly and easily reset. Random takes a random move. You know this can be reversed. Many random moves will be harder. github

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