PlayStation Plus is offering a two free games this month, Thomas Was Alone and Unit 13, for the Instant Games Collection.

Thomas Was Alone is for the PS3 and PS Vita, and is primarily a puzzle platforming game using shapes. Unit 13 is a Vita exclusive in the vein of classic third person shooter SOCOM.

The two games will be appearing in the PlayStation Store later tonight.

A number of other games are also available for free this month on PS Plus. The games include: Dead Nation: Apocalypse Edition for the PS4, Brothers A Tale of Two Sons and Tomb Raider for the PS3, and Pixeljunk Monsters Ultimate HD, and Smart As for the PS Vita.

Sony recently announced more than half of their PS4 sales have resulted in their customers also buying a PS Plus subscription.

"All the 4.2 million PS4s that have already moved into the hands of consumers, more than half of the people that have now gotten their hands [on] the PS4 have actually signed up for PS Plus service, which bodes very well for us," said Sony CEO Kazuo Hirai in a conference call, according to a transcript from Seeking Alpha.

Polygon is reporting this figure remains unclear if the different types of subscriptions are factored in. There was a free 30-day trial, and now there is currently a yearly, three month, and one month version of PS Plus.

The PlayStation Store now has game rental listings on the site, and some released images offer an inside look on how the system may work.

An image released by Gaikai's website, shows the PS3 game Catherine is available in three forms; 1 day, 7 day, or 30 day rental. All three rentals are there for free, which indicates it may not be ready to go yet. See the image here.

According to Polygon, Sony confirmed the listings are up, but transactions can not be completed because they are not live yet.

PlayStation Now prices may have been revealed according to new concept art that is making its way around the Internet.

IGN reported, it could possibly be between $4.99 and $5.99 to rent a streamed PS3 game. The Gaikai website showed a picture featuring Uncharted 3 and Far Cry 3 with little blue PS Now triangles and a price next to them. See that image here.

PlayStation Now is expected in North America by the end of this year, and in Europe in 2015.