June 21 · The Solstice

HELIOS

The Longest Day

On the longest day of the year, sunlight is your only tool. Bend it with mirrors, divide it with splitters, and channel it through optical logic gates to wake the sleeping crystals. Build a circuit of pure light — and at the end of the day, wake the Oracle.

A puzzle of light & logic · an ode to Alan Turing

How to play

  • The goal. Light every crystal on the board. When all glow at once, the day is won.
  • Place pieces. Drag a piece from your tray onto any empty cell. Click a placed mirror or splitter to rotate it.
  • Mirrors bend a beam 90°. Splitters let the beam pass and send a copy at a right angle.
  • Logic gates are the heart of it. AND fires when both inputs are lit, OR with either, XOR with exactly one, and NOT fires only when its input is dark.
  • The sun is your clock. It arcs across the sky as you work. Solve before it sets.

Every gate is a tiny computer. Alan Turing showed that logic can be built from almost anything — here, you build it from light itself.

Level 1/10
First Light 05:30
Daylight
Score 0

—

The Oracle wakes.

0Total Score
0Best

“We can only see a short distance ahead, but we can see plenty there that needs to be done.” — Alan Turing, 1950