POLY//DEFENSE

A minimal techno tower defense where your defense becomes the track.

Build beside the route. Find the pocket between the beats. Every tower is an instrument, and every successful attack adds a note to your track.

Choose the dry punch of Warehouse, the deep echoes of Dub Lab, or the metallic pulse of Metal Cell. Double up your instruments, shift their rhythm with on-beat and off-beat placement, and shape their sound with powerful FX.

The pressure builds toward a peak in about two and a half minutes. Survive longer, or finish your session and listen back to a four-bar reconstruction of your final defense.

See the sound

• Green — Low / Pulse: kicks, bass and subs form the foundation.
• Blue — Tone / Space: chords, bells and beams add pitch and space.
• Coral red — Hit / Texture: hats, claps and percussion fill in the groove.

Towers pulse, spring and glow when they attack. Their colors follow each shot and appear in the 16-step display, so you can see which sounds are shaping your track.

Three sound sets. One defense.

18 instruments across three sets, four routes, and tempos from 100 to 200 BPM. Place up to 14 towers, combine on-beat and off-beat patterns, then add up to two FX per tower to change both its sound and its combat behavior.

How to play

• Pick a tower and place it beside the route.
• ● cells play on-beat. ○ cells shift the pattern by one sixteenth note.
• Press New Run. Towers make sound only when they attack an enemy.
• Spend earned energy on more towers and up to two FX per tower.
• Reroll changes the route and tempo. Reset Run keeps your arrangement.
• At the end, press Play Final Loop to hear what you built.

Desktop browser · Mouse or keyboard · Headphones recommended

Keyboard: focus the grid, use the arrow keys to move, and press Enter or Space to place or select a tower. Sound begins after you press play. If you leave the tab, the game pauses automatically.

Development build: balancing and visual polish are ongoing. Feedback is welcome.

Made with AI-assisted code and interface writing. Visuals are drawn in Canvas and the instruments are synthesized with Web Audio; there are no downloaded music tracks or sample packs.