Your goal is to guess where the blocks
are
located. To that end, you send signals in from the side of the
grid. To send a signal, just click beside the grid, and a signal
will be sent from that place into the grid.
If you hit a block
straight on, it will eat
your signal, giving you a red marker where you sent the signal
from. If, from the signals point of view, the cell to the left (or
right) of the next
cell is a block, the signal
turns right (or left).
If the signal reaches the outside, the place where it escapes and the place you sent if from is marked with the same (yellow) symbol.
