Signal Grid · 3 MIN READ
Signal Grid: understand what overlapping switches cancel
Reason about a press as a set of changes. A worked two-by-two example explains why pressing an unlit square can be the right move.
A PUZZLE TO REASON
How to play Signal Grid
Clear a five-by-five field of lights. A press changes its own square and the squares touching its four sides, turning a simple switch into a puzzle about overlapping effects.
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Your counters describe this puzzle only. Take as much time as you like.
TRY A DIFFERENT APPROACH
Field notes for Signal Grid.
Signal Grid · 3 MIN READ
Signal Grid: solve one row at a time, then check the last
Once you choose the first row of presses, the rows below are forced. Learn the method, its last-row test and the mistakes that make it seem unreliable.