On the Subject of Critters

At least these bugs are not game-breaking.

The module displays an 8×8 grid of tiles and a taller tile on the right. To solve the module, iterate the grid according to the procedure described below and toggle tiles accordingly. Pressing the button on the right will submit your answer. Striking or pressing the button on the top will reset the grid.

The grid has two sets with 16 2×2's each. The main set is obtained by dividing the grid into a 4×4 array of 2×2 groups. The alternate set uses the corners of these 2×2's as its centers and the centers of the 2×2's as its corners. Some of these 2×2's will wrap around.

In the following table, look up the colour of your tiles and execute the corresponding ruleset. The instructions will apply to each 2×2 in the set used, individually. Use the condition corresponding to the number of coloured (active) cells in the 2×2.

yellow (standard) pink (alternate) blue (reverse)
  • 0, 1 or 4: Toggle the state of each cell in the group.
  • 2: Keep the group as is.
  • 3: Rotate the group 180 degrees and toggle the state of each cell.
Iterate once with the main set, then once with the alternate set.
  • 0, 1 or 4: Keep the group as is.
  • 2: Toggle the state of each cell in the group.
  • 3: Rotate the group 180 degrees.
Iterate once with the main set, then once with the alternate set.
  • 0, 3 or 4: Toggle the state of each cell in the group.
  • 1: Rotate the group 180 degrees and toggle the state of each cell.
  • 2: Keep the group as is.
Iterate once with the alternate set, then once with the main set.