1 × 1 to 10 × 10 • Lenient time limit • Quick hints
1 × 1 to 12 × 12
1 × 1 to 20 × 10 • Second number always ≤ 10
2 × 2 to 20 × 20
2 × 2 to 20 × 20 • Stricter time limit • Delayed hints