Blind Corners
Fire beams into a dark box and work out where its mirrors hide
About Blind Corners
A daily deduction puzzle: three new boxes every day, the same for everyone. A dark box hides a few mirrors. Fire a beam of light in from any edge and you learn one thing only: where it comes out. Every mirror it met on the way turned it around a corner you could not see. Mark where the mirrors must be, watch the beam run through your marks, and check when every beam is explained. Each beam costs a point, so find the mirrors in as few as the par, then share your result without spoiling the box. Missed a day? Every earlier day stays playable.
Trouble with the frame? Open Blind Corners on its own page.
How to play
- The game opens on today's Easy box. The tabs above it, or the keys 1, 2 and 3, switch between Easy, Medium and Hard.
- Tap an arrow on the edge of the box to fire a beam in. It turns at every hidden mirror it meets, and the box shows only where it comes out: both ends get the same number and colour.
- Tap a square inside the box to mark a mirror: one tap for a slash, two for a backslash, three to clear it. Marks are free.
- The line on the box is the selected beam running through your marks. A port with a dashed red edge belongs to a beam your marks do not explain yet.
- Press Check (or K) once every beam is explained. If the mirrors are wrong, the box fires a beam that proves it, and that costs 2. Any layout that no beam could tell from the hidden one counts as solved.
- Every beam costs 1. Spend no more than the par, which is what the portal's own solver needed, for a star.
- With a keyboard: arrows or WASD move the cursor, Space fires from a port or marks a square, slash and backslash place a mirror, X clears your marks.
- Press Share (or C) to copy a spoiler-free result, and come back after midnight for the next three.
- Missed a day? The arrows beside the day on the title screen (or the comma and period keys) open every earlier day. Those do not count toward your streak.
