The 10 best racing and puzzle games according to Metacritic:
1. Mario Kart DS (91)
2. Race Driver: Create & Race (76)
3. Need for Speed ProStreet (74)
4. Juiced 2: Hot Import Nights (72)
5. Herbie Rescue Rally (71)
6. Need for Speed Carbon: Own the City (70)
7. Cars Mater-National (69)
8. Need for Speed Underground 2 (65)
9. MX vs. ATV Untamed (64)
10. Diddy Kong Racing (63)
1. Meteos (88)
2. Planet Puzzle League (86)
3. Tetris DS (84)
4. Picross DS (83)
5. Puzzle Quest: Challenge of the Warlords (82)
6. The New York Times Crosswords (79)
7. WordJong (78)
8. Puyo Pop Fever (76)
9. Bust-a-Move DS (75)
10. Zoo Keeper (74)
Full list here:
http://www.metacritic.com/games/ds/scores/