SOLN: Circuit Notebook

A little ink. A few wires. The pleasure of making something work. SOLN is a hand-drawn circuit puzzle game tucked inside an inventor's notebook. Tap to rotate wire tiles, join the circuit, and bring curious little mechanisms to life. Start with a lamp, then discover switches, one-way flow, pumps, and increasingly playful contraptions. TRY THE FIRST 10 PUZZLES FREE Play the first ten authored notebook pages without an account. One optional, permanent in-app purchase opens the rest of the notebook and its extra modes as you progress. No subscription. No ads. No paid cogs. A NOTEBOOK THAT GROWS WITH YOU Work through chapters of new ideas, one page at a time. Fixed pieces are marked with ink pins; movable wires turn with a tap. Learn each mechanism by making it work, then follow the circuit through larger inventions. MORE TO DISCOVER WITH THE FULL NOTEBOOK - Daily: a fresh page for the day. - Endless: more generated puzzles using the mechanisms you reach. - Machines: connect multiple pages into a larger working contraption. - Workshop: earn inks, covers, desk pieces, and soundscapes through play. - Drafting Table: after completing the notebook, choose puzzle ingredients and generate fresh boards. The purchase grants access; progress and collectibles remain earned. It does not complete chapters or buy rewards for you. YOUR OWN SMALL WORKSHOP Graph paper, hand-inked lines, and soft yellow power give each circuit a place in your notebook. Solve a page, see its mechanism work, and make the workshop your own. Made for iPhone in portrait, in English. Core puzzle play works offline. Internet access is needed for App Store purchases and restoration. Progress stays on your device: there is no SOLN account or cloud save. Restore Purchase restores eligible full-notebook access, not puzzle progress.