Mirrors bend it
Every tap swings a brass mirror and sends the beam around a corner.
A daily puzzle of light
Bend the light.
Light every lantern.
Night has fallen on the lighthouse islands. Turn brass mirrors, split white light with glass prisms and mix new colours until every lantern on the island glows in its own colour.
- 50 lighthouses
- 4 islands
- Daily lighthouse
- No timers
- Free to play
Playable right here
Light the lanterns
Tap a mirror to swing it a quarter turn. Guide each beam to the lantern of its own colour. Three small boards, then the real islands are waiting in the app.
Board1/ 3
Turns0
Par1
All lit
Solved on par.
Tap the mirror to turn it
Everything a keeper needs to know about light
Splitters share it
Half-silvered glass sends light two ways at once, so one beam can serve two lanterns.
Prisms break it
White light enters a glass prism and leaves as red, green and blue, each on its own path.
Colours mix
Red and green make amber, red and blue make violet, green and blue make cyan. All three make white.
Lighthouse 50 · Storm Cape
Seven lanterns, one solution
The last lighthouse brings every idea together. Every board in the game has exactly one solution, and a par: the fewest turns that light it. Hit par for three stars.
Four islands, fifty lighthouses
Each island brings one new idea, from gentle first boards to fiendish ones.
- Harbour RockLighthouses 1–10Mirrors bend the light
- Fog ReefLighthouses 11–20Splitters send light two ways
- Coral GardenLighthouses 21–35Filters and colour mixing
- Storm CapeLighthouses 36–50Prisms split white light
A lighthouse every day
The Daily Lighthouse is the same board for every keeper in the world. Light it each day to grow your streak.
Calm, never rushed
No timers and no lives. Undo any turn, restart freely and take a hint when you're stuck.
Made for everyone
Colour pips beside every lantern show which light it needs, so the game is fully playable for colour-blind keepers.
Questions
Is Prism Keeper free?
Yes. It's free to play and supported by ads. Optional videos give extra coins or a free hint, and short ads between lighthouses start only after the first few.
When is it out?
Prism Keeper is coming to iPhone first, on the App Store.
Can I play if I'm colour-blind?
Yes. Every lantern and filter has red, green and blue pips in fixed positions, so you can read what each one needs without relying on colour.
Does it need the internet?
No. Play offline any time.
Bug, idea or question?
Email geekzoneprohelp@gmail.com. Please include your phone model and the lighthouse number.