• ✓Not “what's missing” — that one is in the Play Square. Here things move, grow, shrink, swap, arrive
• ✓The difference is always findable: a move of at least a seventh of the board, a size change of at least 1.4× (npm run verify:spotchange)
• ✓Every board is checked to differ in exactly one way, never two
• ✓Built from 72 vocabulary cut-outs already on disk
• ✓EQ: three wrong taps rings the quarter to look at, and nothing is counted against you
• ✓A two-player mode on one screenplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.