Mario Kart DS is one of the best racing games on the DS, and maybe one of the best racing games ever.

User Rating: 9 | Mario Kart DS (DS Bundle) DS
Mario Kart DS is, in one word, ambitious. This title's main hook is the new Wi-Fi so that you can play online.
Start off with the gameplay: Mario Kart DS plays like a kart racer. You use the A button to accelerate, the D-Pad to turn, and X for items. You race three laps around a track against seven other characters, and they will get harder and harder.
The character selection in this game isn't just Nintendo anymore, (spoiler to anyone who hasn't unlocked him) R.O.B. joins the game! You choose Mario, Luigi, Peach, Yoshi, Toad, Bowser, DK, Wario, Waluigi, Daisy, Dry Bones, and R.O.B. They are divided into three classes, light, medium, and heavy.
The graphics in this game are great for a DS game. They are 3D, and the character animations and tracks all look great. Some tracks look like their 8-bit counterparts, deliberately.
There are 5 regular game modes. Grand Prix is the main game, in which you race in 4 increasingly difficult races. Time trial is where you race on a track by yourself for the best time. VS is a mode where you race against opponents, but makle up the rules. You can choose difficulty, the tracks, and style of race. Battle is where you battle in karts in two different modes: ballon battle and shine runners. But, the new addition is missions, where you do missions in 6 different worlds. They work very well, and are a great addition to the series.
But, the newest thing about the series is the WFC mode where you race against oppoenets from all over the world. It is fun, but there are some drawbacks. 20 tracks are available, you can race only against four people, and you cannot drag items behind you. These are the only drawbacks of the WFC, but they aren't too bad of a disappointment.
There is not much to complain about this game, but the uneven items may get you frustrated. People in the back will tend to get more spiny shells and bullet bills that will hurt you. Also, that when you play versus and battle, the opponents' names are just a computer name.
But, those minor complaints, don't detract too much from the game. Mario Kart DS is a great racing title that must be in any Nintendo DS gamer's library.