This week's addition to the PlayStation Plus Instant Game Collection is Dokuro, a PlayStation Vita puzzler-platformer from Game Arts. It's got skeletons and an art style reminiscent of children's books -- and it's regularly $13.99, so "free" sounds terrific to me.
Elsewhere in the store update, PixelJunk Monsters: Ultimate HD is discounted to $11.99 for Plus members, while Max Payne 3 is $7.99 (or $9.99 for everyone else) and the Ultimate Edition is $11.99 (or $14.99 for all users). Those are some mighty fine prices.
PlayStation Plus: Dokuro Marches to PS Vita’s Instant Game Collection [PlayStation Blog]