Key Signature Zapper ⚡
A key signature is heading for the clef. Name the major key before it lands!
Teachers: pick Class mode, go fullscreen, and project it. Students call out the key and you (or a student DJ) press it. Signatures speed up a little with every correct answer.
🏆 60s Challenge Leaderboard ▼
| # | Player | Percent | Score |
|---|---|---|---|
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Ranked by keys zapped in the 60-second Challenge — most correct wins, accuracy breaks ties. Challenge rounds always use all 15 keys.
What is Key Signature Zapper?
Key Signature Zapper is a free, fast way to drill reading key signatures. A clef and key signature glide across the staff; players name the major key before it reaches the edge. Correct answers play the key's tonic chord and speed the next one up a little; wrong guesses knock the signature forward, so guessing wildly doesn't pay. Start with keys up to four sharps or flats, then switch to all 15 — including the enharmonic keys at the bottom of the circle of fifths.
Three ways to play
Solo gives you three lives. Class mode never ends — escaped signatures just count as "got away," so it's safe to project. 60s Challenge uses all 15 keys and posts your score to the world leaderboard when you sign in.
Learn the two rules first
New to key signatures? The last sharp is the leading tone (up a half step = the major key), and the second-to-last flat is the key. Full explanations and mnemonics are in our guide to learning key signatures fast, the order of sharps & flats, and the circle of fifths. For timed drills, try the key signature flashcards.