Definite must own for GBA and DS!
The game itself has basically 2 styles to play in. You can play in campaign, or in another style where you pick the type and place where you battle. In this mode you can also create your own maps to play which is handy when you just want to annihilate something.
I have to admit that at times the game did get a little bit repetitive and challenging, but it in the end it is worth the money. I suggest everyone go to their local game store and pick up this game for under $15 and go at it. This truly is a must own game for the GBA and DS systems.