Last week new additions to Microsoft's virtual marketplace were spearheaded by Halo: Reach's latest volley of downloadable content, the Defiant Map Pack. This week's focus, however, shifts to ghost wrangling. Sanctum of Slime gets messy on XBLA tomorrow.

　　Leading the pack this week on the Xbox Live Arcade is Atari's Ghostbusters: Sanctum of Slime (800 MS points, or $10). Due out on Wednesday, the top-down game set in New York City will be a cooperative adventure game playable online or offline with up to four players. It will drop players into the boots of the Ghostbuster team's newest recruit and task them with working cooperatively to take down towering bosses. Also, gamers will have a range of weaponry at their disposal, including the proton stream, the plasma inductor, and the fermion shock.

　　Also out tomorrow on the XBLA is Hothead Games' Swarm (1,200 MS points, or $15). Swarm will put players in control of up to 50 swarmites at a given time, guiding the entire pack through puzzling levels fraught with danger from spinning saw blades, poison gas, high explosives, and more. At least one member of the swarm will need to avoid becoming a splatter on the ground in order to collect DNA and pass each level.

　　Switching to the Games on Demand space, Microsoft added three new games to the download spot today, the first of which is Ubisoft's Wild West shooter Call of Juarez ($20). The other two new full-game downloads available now are Supreme Commander 2 ($30) and the movie tie-in game Cloudy With a Chance of Meatballs ($50).

　　Gamers looking to try before they buy can grab a demo for WWE All-Stars today from Xbox Live. The sampler gives players a first look at and feel for THQ's latest WWE-licensed game. The wrestling game is due out in full on March 29.

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