1) Single Player - Play against AI or against a WIFI opponent
Or against 11 Wifi opponents. You can chose number of AIs
2) Multiplayer 2 player splitscreen. Race each other. No AI characters.
No - you can play with 10 AI characters even if you play multiplayer. 8 with 4 player. Online possible too.
3) Multiplayer 3+ players splitscreen.
No, you can have 8 AIs (9 if 3 players) on screen.
No possibility for online.
4) 2 Battle Modes -- Balloons and Coins. Bombs seem to be missing.
Correct, but team only for online, don't know about offline.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS