Following up on Amanita's Samorost series, Machinarium chronicles a scrapped robot's quest to save his robotic girlfriend from the Black Cap Brotherhood. The PlayStation 3 port of Machinarium was featured in a previous PlayStation Plus giveaway.
This week's PlayStation Plus update also hosts a members-only discount for the newly launched Vita version of Spelunky, along with steep price drops on select indie games. Many are half-off or more, including Retro City Rampage for $5, Limbo for $7.50, Tokyo Jungle for $7.50, Journey for $7.50 and Retro/Grade for $5.
The deals will be available as soon as PSN updates later today, and you can look at the full list of discounted games over on the PlayStation Blog.