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Logic Lighthouse
Light the lighthouse with switches and logic gates
Each lesson sets a goal: for which inputs should the lighthouse shine? Add parts, choose where each part takes its inputs from, and connect the result to the lighthouse; every wire shows 0 or 1 as you go. Then press "check", and the game tries every input combination. The lesson passes when all of them match.
The game screens are in Chinese for now. The puzzles themselves are visual, and this page explains the rules in English.
- Original
- No sign-up
- Saved locally
- Free
How to play
- Pick a lesson and read "how to start".
- Add a part, choose its inputs from the drop-downs, then choose which signal the lighthouse receives.
- Flip switches A, B and C and watch the lighthouse and every part change.
- Press "check all combinations". If the whole truth table is right, the lesson is passed.
- Up to 12 parts per board; wiring and adding or removing parts can be undone and redone. After a check you can download the truth table (CSV) and the circuit (SVG).
Controls
Everything uses buttons and drop-downs, no dragging, so it works on phones.
Progress and saves
- Progress is saved automatically in this browser, so you can close the page and pick up where you left off.
- The game's own save panel can download a JSON backup. Make one before switching browsers or clearing data.
- Signed in to lyrasama.com, you can use "Account save" at the top of the game page to keep your progress in your account and load it on another device.
FAQ
Do I need to know electronics?
No. Lesson 1 starts with the lighthouse wired straight to A, then adds NOT, AND, OR, XOR and majority vote step by step.
Is this a real circuit simulation?
No. It is ideal combinational logic: only 0 and 1, with no voltage, current, timing or real components.
Do I need an account or to pay?
No. The games are free, with no ads or in-app purchases. A lyrasama.com account is only for keeping your progress in your account; you can play everything without one.
Where is my progress stored?
In this browser on this device; nothing is uploaded. Clearing browser data or private browsing loses it, so download a backup from the game's save panel first.
Do you collect data about me?
Only daily counts per game: opened, level cleared, came back on a later day, and played for 5 minutes. No identity, IP address or game content. Nothing is counted when your browser sends Do Not Track or Global Privacy Control.
Another question, or found a bug? Let us know.