"One skilled in the art of stealth -- Nintendo DS". That's the hint Amazon is offering for a Gold Box deal that will go up today at 6PM PST. We don't know the exact identity of the offer, but we can speculate!
Our guess is Ninja Gaiden Dragon Sword, which just happens to be one of the best games of 2008. What a delight it would be to get it at one of the best prices of 2008! Other ninja-related games we can think of offhand include N+ (another honoree!), Ninjatown (wow, a lot of ninja games in our top 10), Tenchu: Dark Secret (not so great), various Naruto releases, the Izunas, Ninja Reflex, and Taito's Legend of Kage 2 -- which you can get for cheap right now.
[Update: it's Ninjatown for $20!]