FlowVision: One Line Puzzle

Ten worlds. One rule: trace every line without lifting your finger…

Trace the whole shape. Never lift your finger. Never draw the same line twice.

That is the entire rule of Flow Vision — and it is the last thing about it that will feel simple.

Each puzzle is a figure drawn in light: dots joined by lines, waiting to be completed in a single unbroken stroke. Find the one path that covers every line exactly once and the shape closes with a satisfying snap. Choose wrong and you will feel it three moves later — one line stranded on the far side of the drawing, no way back to it.

Nothing is chasing you. No timer, no lives, no streak to protect. Flow Vision is built for the state it is named after: the quiet, complete focus of a problem that fits entirely inside your head.

A CATALOG BUILT TO CLIMB Ten worlds are laid out ahead of you, Iron through Legend, each with its own colour and its own temperament. The climb opens with 50 hand-checked Iron puzzles — enough to learn to see the path before you commit to it — and the higher tiers unlock as the catalog grows. Every puzzle you close is recorded with three stars and carried across every device you own.

NATIVE ON EVERY SCREEN YOU OWN One app, built properly for each platform: iPhone — one thumb, one stroke. iPad — trace with a fingertip or Apple Pencil. Mac — a real Mac app, with menu bar commands and Undo Stroke on Command-Z. Apple Vision Pro — puzzles suspended in your space, solved with a look and a pinch. Progress syncs through iCloud on its own. The puzzle you leave on the train is the puzzle waiting on your Mac.

BEING STUCK IS OPTIONAL Every level ships with its solution. Watch it draw itself, stroke by stroke, and see exactly where your path went wrong. Solution credits are there if you want them — and every puzzle in the game stays fully solvable without spending anything.

MADE THE WAY IT SHOULD BE No ads. Not one, not anywhere. No account, no sign-up, no tracking. Plays completely offline — on a plane, in a tunnel, at 3%. VoiceOver, Dynamic Type, and Reduce Motion supported throughout. Light and dark, following your system or your choice. Mute any single sound effect, or all of them. Siri and Shortcuts: "Play Flow Vision."

Written in Swift with SwiftUI and SpriteKit. No third-party SDKs, no analytics, nothing phoning home.

One line. Every line. Once.