The rule from the book's figure
In chapter 4 the book draws a Minpentai board in motion (c4-b5), and a player names its rule: "rotate one eighty if three" (c4-b7). This board runs that rule, recovered from the figure, and opens on the figure's first frame.
0 OR 4 LIVENothing changes.
1 LIVEOn odd turns it jumps to the opposite corner.
2 LIVEEvery cell flips: live becomes empty, empty becomes live.
3 LIVEOn even turns the block turns half a circle.
The blocks shift one cell diagonally every turn, so cells pass from block to block. Nothing is ever created or destroyed.
Cells live in 2 × 2 blocks, and the blocks shift one cell diagonally every turn. The game in Learn and Free play does not use this rule: its rules are invented for this edition.
HOW THE RULE WAS RECOVERED (GITHUB) →