Touch: tap a creature in the tray to perch it in the well (tap again to remove it); tap the M and S dots under a perched creature to mute or solo it; drag a perched creature left or right to reorder; in Echo use Hear target, then Echo! to submit; the pause and Menu buttons are at the top · Keyboard: number keys 1-6 perch or remove each creature, Space pauses and resumes the loop, M mutes, H hears the target, Enter submits in Echo (or advances after a win), R records a tape in Jam or retries in Echo, Esc returns to the menu; on desktop you can also click every control with the mouse
About:
A loop-building music toy in the spirit of the 2000s Flash classics, made in-house for Leetdom. Six abstract creatures each own one voice of a sixteen-step loop — a pulse, a shimmer, a bass drone, a lead, a warm pad and a bell. Tap a creature to perch it around the well and its part folds into the groove on the next bar; tap it again to send it home. Every perched creature carries a mute and a solo dot, you can drag them to reorder the row, and the whole thing stays locked to the audio clock so nothing ever drifts.
There are two ways to play. Jam is a free sandbox: layer any of the six, mute and solo and reorder until the loop feels right, then Record a tape and Load it back later. Echo is a challenge with real win and lose: the well hums a hidden chorus, you listen, and you rebuild it by perching exactly the right creatures — no more, no less. Ten choruses climb from a single creature up to the full six; each tells you what you are missing or what is extra and keeps your build so you can tweak and echo again, and solving in fewer attempts and listens earns more stars.
Every sound is synthesised in code from a shared minor-pentatonic scale at 96 BPM — there are no audio files, no images and no network at all. A lookahead scheduler reads the browser's audio clock so the beat lane and the creatures' bob stay in time, and a limiter keeps the mix clean no matter how many creatures stack up. The art is drawn procedurally on a canvas that fits any phone or desktop, portrait or landscape.
Credits:
Made by Leetdom, 2026. Written for Leetdom, and it lives here.
Phone check: 2026-10-03 (self QA): the Echo win rule is a pure set comparison in game.js, exercised by a node test (scratch/test-sim.js, 126 assertions, 0 failures) that loads the real audio engine and the real LEVELS from game.js and proves every one of the ten levels is won by its exact target in any order, that empty/subset/superset/muted-required builds all lose with the correct missing/extra report, and that placing all six then muting down to the target also wins. In the browser via real Chrome DevTools Protocol input (no automation library): a portrait phone (390x844) and a landscape phone (844x390) with real touch, and a 1280x800 desktop with mouse and keyboard, each played the full first-minute loop — enter a mode, hear the target, perch creatures, win, one-tap advance, deliberately lose, one-tap retry keeping the build, then win again; the playhead was confirmed to advance off the AudioContext clock. A hidden tab suspends the audio and pauses the transport and resuming restores it; blocked localStorage still loads and plays; across every run there were zero console errors and zero network requests of any kind. Audio was rendered offline (OfflineAudioContext) over a four-bar full six-creature loop: peak -1.86 dBFS through the limiter, the UI blips sit 24 dB below the musical loop, a sparse single-voice render drops to a true-silent -180 dB between hits, and there is no harsh high-frequency hiss (high-pass/full RMS ratio 0.09).
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