Diddy Kong Racing, Nintendo's big game for the holidays, appeared out of nowhere. At E3 in June, no one even knew it existed. Banjo-Kazooie and Conker's Quest were to be Nintendo's killer games for the fourth quarter. But when it became apparent that neither was going to be ready this year, Nintendo pulled the old switcheroo and opted for Diddy Kong Racing, which, in the grand scheme of things, probably wasn't supposed to see the light of day for months.