A casual color-matching puzzle game set in deep space. Strings of colored pieces fall onto your grid — steer them, stack them, and build patterns that fuse and release their energy.
No timers. No rush. Nothing in the game ever hurries you, buzzes at you, or punishes a slow hand.
I have Parkinson's, and I built StringFusor the way I need it to be: the board waits forever — pieces never fall on their own; undo is unlimited, so a slip is never a loss; the buttons carry a tremor‑tolerant debounce, so a shaky double-tap counts once; and the whole game is deliberately calm — no flashing alarms, no countdowns, no pressure. If puzzle games have ever felt too fast, this one was made for you.
gerard ziemski, cofounder, halfmarbleReal captures — the reactor floats over a slowly turning night Earth, and the patterns you build release their energy in place.
One reactor, two tracks — and a gentle orientation that teaches by building, not by reading.
The complete game, free. Every pattern can fire, the difficulty ramps as you play, and each day the whole world gets the same board — same strings, same order — with one pattern paying double. Compare honestly.
Self-directed: choose your colors and string length, browse the pattern ladder, pick the exact shape to build next. Harder shapes hold more potential energy — and pay for it.
An optional first drill: build the six easiest patterns once, at your own pace, on a fixed board every player shares. Ranked by fewest steps — never by time.
Re-watch any run move by move — every drop, shift, and rotation from the first piece to the fusion — and scrub through it to see exactly how the pattern came together.
From the two-color zigzag to the four-by-four diagonal — over a dozen named pattern families, each priced by how hard it truly is to build on purpose.
An on-device generator that invents brand-new symmetric patterns nobody has cataloged, tests that they can actually be built, and offers them as one-off targets. Endless, and entirely on your phone.
The reactor floats over a night-side Earth with real city lights and drifting clouds, a phase-lit Moon, and point-cloud galaxies — all rendered live, with an original synthesized score.
Daily and all-time leaderboards if you want them. Leave Game Center off and your scores stay entirely on your device.
StringFusor collects no data about you — no sign-in, no analytics, no advertising, no third-party SDKs. Settings and scores live on your device.
The Progression track — the complete daily game — is free forever. One purchase, Fusion Core, opens the Experiment track and the Pattern Forge: $3.99 for the first two weeks, then $4.99 — no subscriptions, no consumables.
There are no accounts and no cloud sync. Your settings, replays, and best scores are stored on your device only — the same local-first stance behind everything halfmarble builds.
Read the full privacy policy, get support, or see halfmarble's Glass Box data philosophy.
5% of software net profits pledged:
2.5% to the Michael J. Fox Foundation (MJFF)
2.5% to Public Health Collaboration (PHC UK)
halfmarble is an independent Team Fox third-party fundraiser.
