Hikari Fold
A mirror. A path. A little light.
Draw a mirror, guide the light
Draw a diagonal inside a dotted socket to place a mirror, or tap to cycle empty, slash and backslash. A diamond splitter stays in place and switches orientation. Light updates when you finish drawing.
Six chapters, 36 rooms
Choose any room from the collection. Learn reflection, route around walls, mix colors at receivers, split a beam and filter white light. The last chapter combines the mechanics. There is no time limit or daily-login requirement.
Colors combine at the goal
Red plus green makes yellow, red plus blue makes purple, and green plus blue makes cyan. Beams crossing in open space do not mix. Each receiver absorbs light and must receive exactly its requested color components; extra components prevent a clear. R, G and B labels supplement colors.
Splitters and filters
A diamond mirror sends light both straight and reflected. A filter passes only its marked color component. White light contains red, green and blue. Walls block light.
Undo and hints
Undo, erase and restart help you experiment. Hints are unlimited: tap once to preview one correct placement and again to apply it. Hints and all 36 rooms work offline.
Sound, progress and support
Free, with no ads or purchases. iPhone with iOS 17 or later; Japanese and English. Original music, effects, haptics and reduced motion can be adjusted in Settings. Silent mode mutes audio. Progress stays on this device. To report an issue, include the room number, iPhone model, iOS/app version and steps; never send passwords or private information.