I'm on the first of the last two chapters in Advance Wars.
Incidentally the one character I actually like to use, Sami, gets ALL of the insanely hard maps.
Her version of the "Enigma" map is by far the hardest level in the game yet, and is easily much harder than any Fire Emblem level I've played.
This is what we're looking at.
Basically, imagine your victory depends on using a Pegasus Rider to get to the corner of that map...while being set upon by five flying archers. Forever.
At least Sturm's music is cool. I can rock out while I'm getting my *** handed to me. >.>