Piano Jumper

Piano Jumper was created for js13kGames 2026: Unicorns and Rainbows.

A unicorn walks a piano keyboard seen from the side. Moving is playing: crossing from one key to the next sounds that note. Play the tune, and the rainbow above completes itself.

Controls

• Arrow keys, or the on-screen buttons on touch.
• Hold Space (or JUMP) and release to leap. Hold longer to go farther.
• Release with no direction held to hop in place.

How to Play

1. The next note is highlighted. Blue means you can walk there.
2. Yellow means it needs a jump. Watch the landing marker while you charge.
3. A repeated note is a hop in place, not a step.
4. Black keys are obstacles, not platforms. Land on one and you play a wrong note.

Clear at 80% accuracy. The song always finishes — a rough run just leaves the rainbow gap-toothed, and you still get to hear your take played back.

Every white key is in C major, so a fumbled note stays in tune. Only the black keys sound wrong.

Features

• Four public domain tunes: Ode to Joy, London Bridge, Twinkle Twinkle Little Star, When the Saints Go Marching In.
• Melody only, generated with oscillators. No audio files.
• The rainbow is the progress bar, the score and the pass condition in one object — one wedge per note. Its seven colours are the seven white keys of an octave.
• A replay of your performance after every song, wrong notes and all.
• The entire game is a single HTML file under 13KB.

Created by WAKKIN.