• ✓T7 from the Teen Square catalogue · Luna's observatory dome
• ✓The method first: the technique is named — read across, then read down — with a worked 3×3 whose rule is spelled out in words
• ✓Every cell is geometry in code (SVG) — not one image file in the whole game
• ✓The generator came before the UI: every attribute follows P[(a·r + b·c) mod 3], which is why the game can always say the rule out loud
• ✓2,000 puzzles machine-checked — all 162 possible figures brute-forced, exactly one answer each, and no distractor that also fits (npm run verify:matrix)
• ✓A four-rung ladder: shape → + how many → + shading → + the turn
• ✓A wrong tap gets a place to look, not a verdict — the first lights up the bottom row and right column, the second says one rule out loud
• ✓The Kidsquare Rule: three misses in a row buys a breath with Poppy, and the counter resets afterwards
• ✓A build-your-own mode: the player sets the rules and someone else finds the missing cellplanned
• ✓A painted observatory dome of its own — it borrows the space plate for nowplanned

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