• ✓Two rooms, and the first has no rules at all — a child who is decorating is doing something real and does not need it scored
• ✓The second room is where the learning is: a customer asks for something exact, which means knowing which hand is the left one, which finger is the ring finger, and what an alternating pattern is
• ✓Finger names are something a four-year-old is genuinely learning, usually by being pointed at — here they are what stands between the child and the nail they want to paint, which is a much better reason
• ✓The names stay written on the hand the whole time — this is not a memory test, the point is using the name rather than recalling it
• ✓One hand at a time, and that is an accessibility decision rather than a design one: two hands on a 390px screen puts every nail under the house's 44px minimum
• ✓Three skin tones, because a child painting nails should be able to find a hand that looks like theirs
• ✓The verifier proved every order before any UI existed: doing exactly what it asks must pass, empty hands must not, no order may ask for two colours on one nail, and every colour and sticker named must actually be on the shelf
• ✓The stickers are Kidsquare's own paintings, but the source files are fully opaque on white — fine on a page, a white box on a fingernail — so all twelve were cut, keeping the white die-cut rim a real nail decal has
• ✓Play-tested at 390px: polish and sticker both land, two orders accepted, and an unfinished order says what is left rather than saying wrong
• ✓The hands are still drawn rather than painted — a real hand shape with knuckles and five nails, but not Kidsquare watercolour yet, and waiting on a painted pairplanned

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