About Beam
Beam is a free daily logic puzzle about light and mirrors. Each board has one or more lamps around the edge, a scattering of crystals, a few walls and some smudges. You get a small, fixed number of mirrors. Put them on the right squares, angled the right way, so that the lamp beams bounce onto every crystal without ever touching a smudge. There are no words in Beam, so it plays the same in every language, and everyone in the world gets the same four boards each day.
A mirror always turns a beam through a right angle. A ╱ mirror sends a beam travelling right upwards, and a ╲ mirror sends it downwards. Beams pass straight through crystals (lighting them on the way), stop when they hit a wall or the edge, and fail the moment they touch a smudge. A good first step is to look at each crystal and ask which beam could possibly reach it. The smudges are there to rule out the easy shortcuts, so they are often the best clue to where a mirror must not go.
Every day there are four boards made from that day’s seed. Easy is a small board with one lamp and two mirrors. Medium adds a second lamp. Hard asks for five mirrors on a bigger board, and Master is a bonus with three lamps and up to six mirrors. A solver checks each board, and the generator adds smudges until, wherever possible, only one arrangement of mirrors works. Light Easy, Medium and Hard to keep your streak going. Hints lock one correct mirror in place and cost a star.
Want more? The Beam level pack has 120 fixed boards in six chapters, from a single mirror up to master boards. Your progress there is saved in this browser and never affects your daily streak.