🧱 Stack for kids
Stack's rules fit in one sentence — drop the moving block dead-centre on the base. — which is exactly the right size for a kid mid-car-ride. And unlike most "free" kids' games, there's no coin shop waiting behind level three and no stranger chat lurking behind the play button.
Why it works for kids
Instant rules, instant feedback, short rounds: a Stack round ends in seconds, so attention never has time to wander and "one more try" stays harmless. There's no reading requirement beyond a number or two, no fail-state that deletes progress, and no download — it runs in the browser on whatever device the family already has, including the hand-me-down tablet.
The parent-relevant part
No chat with strangers — duels exchange scores, never messages. No account means no personal data collected at signup, because there is no signup. Nothing in the game requires payment (one optional cosmetic upgrade exists for adults who enjoy golden usernames). And the family duel angle is genuinely good: challenge links let a kid battle a parent or cousin directly — and since kids' reaction times improve naturally every year, the day they finally beat you is mathematically scheduled. See average reaction time at age 10 for the science of your impending defeat.
How to play Stack
- A block slides side to side above a fixed base.
- Tap to drop it. One drop — no undo, no second run.
- Your score is the overlap: how much of your block landed on the base.
- Better alignment than your opponent takes the round.