Black Box
An invisible ball can turn a beam back on itself. Read the marks around a sealed box and work out where the balls must be hiding.
How to play
Click a square on the rim to fire a beam. H means a hit, R means a reflection, and paired numbers mark entry and exit. Click inside the box to place balls, then use the green button to check your layout.
Playing tip. Send a ray in from the edge and note where it comes out. Test your proposed ball positions against more than one ray.
Read the game instructions ↗Game by / provided by Simon Tatham’s Portable Puzzle Collection ↗ · License
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