These puzzles might be interesting if you've not tried them before. They're quite ordinary though.

http://www.hkkccs.edu.hk/~tc02/math-games/game1.html

http://www.hkkccs.edu.hk/~tc02/math-games/game2.html

http://www.hkkccs.edu.hk/~tc02/math-games/game3.html

http://www.hkkccs.edu.hk/~tc02/math-games/game4.html