Support

Yes. There are no in-app purchases, and all 5 chapters are free. A banner ad is shown at the bottom of the home screen and the stage list (never on the board).

iOS 17 or later (iPhone / iPad) and Android 8.0 (API 26) or later.

Drag from a switch, a gate pin, or a lamp to another pin. Each input takes only one wire; connecting again replaces it. Tap a wire to remove it, and drag a gate box to the trash at the bottom to remove it. Open How to Play anytime from the ? at the top right of the board.

Use the list button at the top right of the board (Wire List) to choose, for each input, where its wire comes from. The game also works with VoiceOver on iOS and TalkBack on Android.

Clearing a stage unlocks the next one. A new chapter opens when you clear the last stage of the previous chapter, because that stage completes the part you need next.

From Chapter 3 on, the tests run in order and the circuit keeps its state between them. Right after power-on the stored value is undefined, so the tests start with a reset or a write clock before checking. Try flipping the switches in order on the board to see the circuit remember.

Personalized ads: Settings (top right of the home screen) → Ad settings lets you choose Allow / Don't allow at any time.
iOS tracking (ATT): Settings → Privacy & Security → Tracking → ROJIRAKU.
Android advertising ID: Settings → Privacy (or Google) → Ads lets you reset or delete it.
See the Privacy Policy for details.

Use Reset Progress in Settings (top right of the home screen) to erase all stars, circuits, and parts you made. This cannot be undone.

The app follows your device language and switches between Japanese and English. Other languages show English.

Please email us at the address below. The stage number, steps to reproduce, device model, and OS version help a lot.