• ✓Not tap-two-and-they-vanish, which is a memory game with laundry on it — nothing disappears, only positions change
• ✓Because nothing vanishes, the child has to hold a plan: that one belongs over there, so this one moves first — which is what sorting a real basket asks
• ✓Pairs are told apart by PATTERN, not colour alone, so a colour-blind child can win — and the verifier refuses a set where two kinds share both
• ✓The fewest-swaps figure is computed from the board — permutation cycles over every target arrangement — not a number somebody guessed
• ✓Every level checked before any UI (npm run verify:socks): it must not start solved, must need at least two swaps, and must always have a swap that gets closer
• ✓The sound reports whether that swap FINISHED a pair — the only feedback a four-year-old needs and the only one they notice
• ✓Play-tested at 390px: level one solved in 3 swaps against a computed minimum of 3 · 68px tap targets · no console errors
• ✓Kidsquare's painted socks — the SVG has a heel, a toe, a ribbed cuff and a peg, but it is a stand-in and not the finished artplanned
• ✓A drag mode alongside tap-tapplanned

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