rulehunt

Each row is made from the one above. A cell looks at itself and its two neighbours (the row wraps around) and the rule table says what it becomes. Click a box in the table to flip its output.

Make the last row of your run equal the target. Red cells in your last row show where you are off. You can also type a rule number.

Score is how many 1s are in your table. Par is the smallest table that works. Some levels have several valid rules, others exactly one.