(A) Games
1. Sudoku online
2. 2048game.com
3. Mathisfun.com
(B) Useful Links
1. EDB Mathematics Education
2. HKEAA
3. HKU Department of Mathematics
4. CUHK Department of Mathematics
5. HKUST Department of Mathematics
6. Mensa Hong Kong
7. Khan academy (Math)
8. 昌爸工作坊