Billy Bug & His Quest for Grub: http://resources.oswego.org/games/BillyBug/bugcoord.html

(Cartesian coordinates)

Banana Hunt: http://resources.oswego.org/games/bananahunt/bhunt.html

(Estimating angle measurements)

Power Lines: http://resources.oswego.org/games/Powerlines/powerlines1.html

(Logic & Addition)

Minefield Maze Game: http://www.shodor.org/interactivate/activities/MazeGame/

(Cartesian coordinates)

Who Wants to Be a Mathonaire? http://www.echalk.co.uk/Maths/PrimaryNationalStrategy_Yr6/DfES-MathsActivitiesforyear6/mathonaire.html

Block Bonanza: http://funschool.kaboose.com/time-warp/pirates/games/game_block_bonanza.html

(Logic)

Mastermind: http://nlvm.usu.edu/en/nav/frames_asid_179_g_3_t_1.html

(Logic)

Tangrams: http://nlvm.usu.edu/en/nav/frames_asid_290_g_3_t_3.html

(Spatial sense)

Fill & Pour: http://nlvm.usu.edu/en/nav/frames_asid_290_g_3_t_3.html 

(Logic)

Number Puzzles: http://nlvm.usu.edu/en/nav/frames_asid_179_g_3_t_1.html

(Logic & Addition)

Peg Puzzle: http://nlvm.usu.edu/en/nav/frames_asid_182_g_3_t_1.html

(Logic)

Counterfeit Coins: http://nlvm.usu.edu/en/nav/frames_asid_139_g_3_t_2.html

(Logic)

Fifteen: http://nlvm.usu.edu/en/nav/frames_asid_327_g_3_t_2.html

(Logic & Addition)

Towers of Hanoi: http://nlvm.usu.edu/en/nav/frames_asid_118_g_3_t_2.html

(Logic)

How High? http://nlvm.usu.edu/en/nav/frames_asid_275_g_3_t_3.html

(Prediction ability & Volume)