Place your mirrors. Light every gem.
A lantern fires one beam of light. Click an empty cell to place a / mirror; click again for \; a third click removes it. Mirrors bend the beam 90°. Gems don't block the beam — light passes through and sets them aglow. Light every gem at once, using at most the mirrors in your pouch, and the day is yours.
Keyboard: arrow keys move the cursor, Enter cycles empty → / → \ → empty, U undoes, R restarts.
About Glint. One board, everyone, midnight. Every daily layout is built beam-first — the light's path exists before the walls do — so a solution is always waiting.