I've been playing Advance Wars games for a long time; ever since the first one came out in 2001 on the Game Boy Advance. Of course, Advance Wars has its roots in the Nintendo Wars series that has a long history in Japan on the Super Famicon and the Game Boy. It's a very entertaining turn based strategy game with a rock-paper-scissors style unit balance and battles fought on chessboard-like grids. One thing that helps its replay value is the always awesome map editor, allowing you to make your own maps and challenges. I love to make maps and I've made a decent amount of them. And I've got a bunch of them in handy image files so I can share them through Giant Bomb.
 
The majority of them are for Advance Wars: Dual Strike, just so you know.
 
Of course, the downside is that this sharing process is fairly old school. You can't download them for games like Advance Wars 2 and Dual Strike. If you're interested enough, you'll have to eyeball it and copy them down to your own cart. It's not nearly as bad as it sounds, but it will take some time.
 
I've created Custom Map galleries for all the major Advance Wars games. You'll find them surrounded by gray borders, half-assed jokes, and weird fonts put together with the magic of Microsoft Paint (some of these are from a long time ago). I'll post a few of my favorite maps collections here to give you a visual example.
 
EDIT: For some weird reason the images aren't magnified to proper size here. They're easier to read if you magnify them in the image galleries.
 

	City Slicking Series

	Kirby Archipelago Series

	Warfare Variety Series