Complete the circuit
Turn the pieces until the path carries power from source to destination.
A circuit notebook for iPhone
SOLN
Hand-Drawn Circuit Puzzles
Turn inked circuit tiles, carry power across the page, and watch each solved machine do what it was built to do.
Inside the notebook
Small circuits. Working contraptions.
SOLN pairs calm circuit puzzles with the tactile character of a well-used inventor's notebook.
See the mechanism work
Fans turn, valves move, and other drawn mechanisms visibly perform when a page is solved.
Fill a personal field notebook
Progress stays on your iPhone. Core play is designed to work offline, without an account.
V1 access
Ten authored pages are free. One permanent unlock.
SOLN is free to download. The first 10 authored puzzles are free, and one optional, non-consumable Full Notebook purchase permanently opens access to the remaining notebook and paid modes as their play-earned progression gates are reached.
Full Notebook never grants solved pages, mastery, rewards, or collectibles. Those are earned through play. No ads. No subscriptions.
Pages from the workbench
Available Now
These are the same ten in-game screens submitted with SOLN V1—real puzzles, progression, the Full Notebook offer, earned Workshop collections, Settings, and dark mode.
