Rochard involves a bit of platforming, but it's mostly about manipulating objects with gravity.

Xbox Live Arcade is hardly a perfect ecosystem, but the company's made its annual summer promotion one of the places to be for developers. It doesn't ensure success--but it helps.

Sony hasn't committed to a similar push for PlayStation Network releases, despite having its own exhaustive slate of exclusive content. Sony's looking to turn that around with "Only on PlayStation Network."

The promotion kicks off October 4, starting with the atmospheric Eufloria and physics-based platformer Rochard, which Brad and I already took a (quick) look at. "Only on PlayStation Network" continues through the rest of October, sometimes with one new release, other times with two.

Some long requested classics are going digital this month, too. God Hand, GrimGrimoire, Maximo: Ghosts to Glory, Odin Sphere and Ring of Red will all be available starting tomorrow.

As a bonus, anyone with a PlayStation Plus account receives 20% off each game, and if you spend $60 on PSN (games, movies, music, whatever), Sony will give you $10 to also spend on PSN.

The full list of games coming this month is as follows:

• Eufloria (October 4)
• Rochard (October 4)
• Sideway: New York (October 11)
• Sodium Collection (October 13)
• Okabu (October 18)
• RocketBirds (October 18)
• inFAMOUS 2: Festival of Blood (October 25)
• PixelJunk Sidescroller (October 25)

It's worth noting inFamous 2: Festival of Blood doesn't actually require you to own inFamous 2, a welcomed change of pace.