JGOWorlds to explore

Find the hidden balls by observing how rays emerge from the grid.

Available External game
Open Black Box Discover the game
A turquoise ray and violet balls on a dark grid beneath the Black Box title.

The game world

Discover Black Box

Send a ray into the grid from one of its edges. Depending on where the hidden balls are, the ray can pass through, return to where it entered, or be absorbed. Compare several shots to work out where the balls could be, then check your guesses. James Harvey contributed this version to Simon Tatham’s collection.

Original wordmark and artwork by JGO.

Your adventure starts here.

JavaScript and WebAssembly. The official site documents Chrome, Firefox, Safari and Edge.

Open Black Box