How it works
Rule: +1, 0, −1, 0 by hex-distance
Each emitter contributes a ring pattern based on hex distance:
distance 0 → +1, distance 1 → 0, distance 2 → −1, distance 3 → 0, repeating outward.
All emitters add together. You win when every cell in your field matches the target field.
Notes:
• Difficulty depends on both board radius and number of emitters. R=2 can be hard if K is high.
• “Show solution” reveals the hidden emitter locations on the target board (useful for learning or debugging).