Spectra is a free, original light-physics puzzle — not affiliated with any paid game.
Trace beams through mirrors, glass prisms, lenses, splitters, filters, and diffraction gratings.
40 handcrafted levels with progressive tools
Spectral ray tracer with dispersion (Cauchy IOR)
Progress saved in your browser
No account, no ads, no paywall
Spectra
levels
Clear a level to unlock the next. Progress stays on this device.
Spectra
1. open path
solved — next unlocked
Select a tray piece, tap a cell to place. Tap a placed piece to rotate 15°. Alt-click (or long-press tools) to remove.