A little ahead of schedule, Warriors Orochi 3 Ultimate is free for Xbox Live Gold members.
For those who have never played it and are understandably put off by the way it appears, don't let the goofy B-movie vibe keep you away; Warriors Orochi is one of the most absurd games I've played in a while, and I mean that in the best way. It is essentially Dynasty Warriors, with an all star cast of characters from various video game properties I won't spoil, as the characters themselves contribute to the game's wonderful sense of wackiness.
You can go here to download it now.