Lumen Hex

Edge beams report how far light shines through clear cells before a solid one stops it, and number clues tell you how many solid neighbours a cell has. Combine the readings to mark every hexagon correctly, with no guessing required.

• Beam clues show the light's travel distance through clear hexes
• Number clues count a cell's solid neighbours
• Mark each hex as solid or clear
• Solve the whole grid by deduction to win

• Desktop: left-click a hex to cycle its state, right-click to cycle back
• Phone & tablet: tap a hex to cycle through unknown, solid and clear

• Daily: one shared puzzle seeded by date
• Practice: solve as many as you like
• Board sizes: Small, Medium and Large

• Start where a beam reading and a number clue overlap to lock in a certain cell
• A beam that stops short tells you exactly where the first solid hex sits
• Mark confirmed clear cells too, since they constrain the neighbouring counts

Two Nikoli traditions meet on a honeycomb. Counting how far light travels before a solid cell stops it is the deduction of Kurodoko; illuminating a grid and reasoning from what the light reaches is Akari, also published as Light Up.

The original combination is edge beams that report depth from outside the grid, alongside number clues giving each cell's count of solid neighbours.

Putting the clues on the border changes the solving order. Square-grid puzzles of this kind seed information inside the board and grow outward; beams entering from the edge mean you work inward from the perimeter, and the hexagonal grid's three axes give every beam more cells to account for.

Lumen Hex is an original free browser logic puzzle in the light-tracing deduction tradition, played on a honeycomb grid. Play instantly with no sign-up.

A free, original browser game on PlayPendium. No download, no install.