PART 1 - Classics

1. Classic (Thomas Snyder)

Answer: 648739152, 386427591

2. Classic (Thomas Snyder)

Answer: 618243597, 854927316

3. Classic (Wei-Hwa Huang)

Answer: 123649578, 982137645

4. Classic (Wei-Hwa Huang)

Answer: 617329548, 829534716

5. Diagonal (Wei-Hwa Huang)

Answer: 187962354, 139452786

6. Odd (Wei-Hwa Huang)

Answer: 756394218, 461938572

7. Just One Cell (Thomas Snyder)

Answer: r5c5, 9

8. Just One Cell (Thomas Snyder)

Answer: r5c9, 5

9. Just One Cell (Wei-Hwa Huang)

Answer: r2c3, 3

10. 0-9 (Thomas Snyder)

Answer: 8970452163, 4695810723

11. Killer (Thomas Snyder)

Answer: 637891245, 382956714

12. Irregular (Wei-Hwa Huang)

Answer:937845621, 178694352

PART 2 - Variations

1. Tight Fit (Thomas Snyder)

Answer:167523489, 564398127

2. Parquet (Thomas Snyder)

Answer: 365712984, 489365721

3. Sudo-Kurve (Thomas Snyder)

Answer: 184697253, 138527649

4. Arrow (Thomas Snyder)

Answer: 172694385, 915284376

5. Bent Diagonal (Wei-Hwa Huang)

Answer: 723195846, 167432985

6. Primrose (Wei-Hwa Huang)

Answer:218369475, 761859342

7.Parity (Wei-Hwa Huang)

Answer: 853169247, 437582916

8. Keypad (Wei-Hwa Huang)

Answer: 834129576, 264713598

9. Pair Product (Wei-Hwa Huang)

Answer: 567381942, 529618374

10. S, as not in Sudoku (Wei-Hwa Huang)

Answer: 518976423, 645178923