🥷 Number One Ninja

Watch the signs. Copy them back. Don't get the letters.

Watch a sequence — don't move yet — then copy the whole thing in order, as fast as you can. Get a sign wrong (or the order wrong) and you earn a letter. Spell N-I-N-J-A and you're out.

First time? Calibrate: hold each sign up to your camera 3 times so the game learns your hands. No video ever leaves your device.

Sign guide

Drag the hand to spin it. Tap a finger name to light it up. Level 2 poses follow the Sharpss definitions (see README) — they are teaching approximations, check them against the Narutopedia seal images.

Teach the signs

Hold each sign steady in front of your camera. The game takes 3 captures per sign — lower your hand between captures. 3/3 unlocks the sign.

Camera starting…

    Level 2 — Training Ground

    Practice only. Level 2 recognition isn't reliable yet — the camera often can't see two interlocked hands, and the guides disagree on some signs. Practice here; scored play unlocks after verified data collection.

    Pick a sign, hold it up, and the game tells you what it sees. This is for learning the shapes — the scoreboard stays closed until the recognizer earns it.

    Camera starting…

    Tip: hold both hands in frame, fingers clear of each other where the sign allows. Interlocked signs (Tiger, Dog, Ram, Boar) are the hardest for the camera to see — if it can't see two hands, it can't guess.

    Calibrating a sign first (Teach the signs) makes the feedback sharper — it learns your hands.

    Round 1 · 0.0s
    NINJA

    Game over

    0rounds cleared
    0.0stotal copy time
    0%sign accuracy (correct vs wrong)

    Challenge a friend

    Same sequence, same signs. Fastest time wins. Send the link — your friend plays the exact same rounds on their own device.

    Challenges are Level 1 only — Level 2 is practice-only for now.

    Leaderboard

    Scores live on this device only (prototype — no server). Enter a challenge code to see its board.