Wrong Soriku, ioi is not number 1. The same man as created ioi is nr 1, but ioi is in fact nr 67. The oldest who has not been deleted (probably due to being a former ioi) is Neos link.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS