Microsoft is celebrating the launch of its new Games on Demand service by offering the games below for 50% off! These prices will last until January 4, 2010, so jump on the chance to pick up some great games at a great price!

Arc Rise Fantasia is a new turn-based RPG with a beautiful, anime-inspired Japanese art style. Players will jump into the shoes of L’Arc, a calm and composed mercenary, who sets out to defend the Meridian Empire from an impending invasion of ferocious creatures.

Alien Breed Evolution is an action packed, tense single player adventure and an absolute blast of a co-op game, a “retro-modern” remake of the 1991 original that helped the now indie dev/publisher burst onto the Amiga scene 18 years ago. Team17 stated that the game's pricing on XBL is at 1200 Microsoft Points, which should be really be 800 Microsoft Points and will be rectified as soon as possible.

Gary Grigsby’s Eagle Day to Bombing of the Reich is a detailed simulation of the Allied strategic bombing campaign against Germany in World War II. Combining both classic titles Battle of Britain and Twelve O'Clock High into a single updated game package, this in depth air war simulation includes all the original appeal of the original two titles with a huge list of new features and improvements.

EA Sports MMA will feature the most authentic, intense and broad mixed martial arts experience to date - complete with a vast array of top fighters and fighting styles from around the world.

Super Street Fighter IV features the full roster of 25 characters from Street Fighter IV such as Ryu, Ken, Crimson Viper, Abel, El Fuerte and Rufus, while adding about eight characters new to the world of Street Fighter IV, such as classic combatants from previous SF games like T. Hawk as well as all-new characters such as the mysterious and deadly female fighter, Juri.

Modern Warfare 2 continues the gripping and heart-racing saga with an unprecedented level of action as players face off against a new threat dedicated to bringing the world to the brink of collapse. While dedicated server support is still nowhere to be seen, Infinity Ward has hinted at upcoming mod tools for the PC community.

Red Dead Redemption is a Western epic, set at the turn of the 20th century when the lawless and chaotic badlands began to give way to the expanding reach of government and the spread of the Industrial Age. The story of former outlaw, John Marston, Red Dead Redemption takes players on a great adventure across the American frontier.

Shin Megami Tensei: Strange Journey, a first-person science fiction RPG for NDS, is a startlingly original entry in the award-winning Shin Megami Tensei universe, Strange Journey takes the heralded RPG franchise to exciting new frontiers.

Free Realms is a free whimsical fantasy massively multiplayer RPG from Sony Online offering lighthearted adventuring, aimed primarily at casual female gamers, and optional bonus content via micro transactions.

In R.U.S.E., players use their brain as the ultimate weapon, fighting a war of perception, where the ability to deceive and mislead the enemy determines success. A first in a strategy game, R.U.S.E. reinvigorates the genre by using deception to give new-found depth to the gameplay.

Puzzlegeddon features a clever mix of puzzle, action and strategy. Select your island of choice and puzzle for resources to defend yourself and to defeat opponents throughout the many galaxies, game modes and challenges in the world of Puzzlegeddon.

Savage Moon is a frantic, action-packed tower defense game in a gritty sci-fi setting. You are tasked with protecting mining facilities from ravenous space bugs using some truly fearsome weaponry. And you’ll need as much strategy as firepower as you fend off wave after wave.

In Heavy Rain you don’t watch the story – you play it. The dynamic narrative unfolds through the players actions - not cut scenes - and every action has a consequence. The latest Famitsu issue reveals a Feb. 18, 21008 release date, but only for Japan. Hopefully the European/North American release date is shortly before or after that.

A departure from the traditional online settings of high fantasy, outer space, or military, Global Agenda is a fast-paced action MMO using Unreal Engine 3 set in Earth's near future, a spy-fi world of advanced technology and player-driven conflict.

Las Vegas Casino Party is an interactive Casinopoly made for the whole family, gathers fifteen of the most fun and popular casino games : slot machines, video poker, craps, blackjack, roulette… and many more !

Fallen Earth is a post-apocalyptic massively multiplayer online game that mixes FPS style with traditional RPG mechanics, where six factions are struggling to emerge from the collapse of civilization brought on by viruses and environmental disaster.

The Dangerous Days of Daniel X is the story of Daniel, a young boy who possesses the incredible power of creation that he inherited from his alien parents. But Daniel also inherited something far more sinister: a frightening Wanted List of aliens that are bent on destroying Earth.

In Virtual City, players build and develop the city of their dreams, whether suburban utopia or bustling metropolis. Virtual City players begin by choosing from dozens of residential homes and industrial buildings, and the possibilities from there are limitless.

Dragon’s Lair is an action/adventure game where you fight your way through the castle of a dark wizard who has enchanted it with treacherous monsters and obstacles on a quest to rescue the fair princess Daphne from the clutches of an evil dragon.