HANABI ZERO

HANABI ZERO is a small grid puzzle about counting down to exactly the right number.

You carry a count. Stepping on a numbered tile changes it. Scattered across the board are firework tubes, each painted with a number of its own. Step onto a tube while your count matches its number exactly, and it launches. Light every tube to clear the stage.

The catch: your count usually only goes down. So the tubes have to be fired in the right order — and later stages hand you orange gunpowder tiles that push your count back up, which quietly turns "walk the obvious line" into "plan the whole route."

Ten stages, a few minutes each. Undo whenever you want — this is a puzzle, not a reflex test.

Controls

• Arrow keys / WASD — move
• R — restart the stage
• Z — undo one move
• Esc — back to title

Theme: COUNT DOWN

Every firework waits for its own number on the way down, so you spend the game descending through a sequence of exact values. Reaching zero isn't the goal — reaching exactly the right number, at exactly the right tube is. And once gunpowder lets you count back up, the order stops being obvious.

Notes

• No AI-generated art or audio assets are used — in fact, this game ships with no image or sound files at all. Every visual is drawn at runtime in code (shapes and particles), and every sound is synthesized live with the Web Audio API.
• The code and this page's text were written with AI assistance, as disclosed above.
• Built in ~4 days for GMTK Game Jam 2026 with TypeScript + Phaser 3.
• Runs in the browser. Keyboard required.