Finally, a reason to fire up your PS3. The Ninja Gaiden: Sigma demo is now available for download. However, if your not into Ninjas, what the hell is wrong with you? But, if you really aren’t into them, you may want to try out Virtua Tennis 3, which is also available for download.

Ninja Gaiden Sigma Demo (free): Play as Master Ninja, Ryu Hayabusa and infiltrate your way into the Vigoor Empire destroying evil ninjas and demons as you attempt to overthrow the Empire, exact revenge on your enemies, and reclaim the Dark Dragon Blade.

Virtua Tennis Demo (free): The fun, addicting, award-winning series continues with Virtua Tennis 3. With ultra-realistic graphics and precise player control, gamers will hit the court and play as or against today’s tennis elite including Federer, Sharapova, Roddick, Nadal, and Williams.