When short on time, 2 × 2 boxes (created by a square of 9 dots) is good for beginners, and 5 × 5 is good for experts.
A 5 × 5 is good for experts. When short on time, a 2 × 2 board (a square of 9 dots) is good for beginners.
When short on time, a 2 × 2 board (a square of 9 dots) is good for beginners. A 5 × 5 is good for experts.
When short on time, a 2 × 2 board (a square of 9 dots) is good for beginners. A 5 × 5 is good for experts.