Starting tomorrow, PlayStation Plus members can nab Monolith's console-exclusive MOBA, Guardians of Middle-Earth, for free. A less-than-active community made it difficult for me to play the Xbox Live Arcade version not long after launch, and I have to imagine things aren't much different here. Hopefully the promo will give the game a nice boost, because it really is worth checking out for a few hours. (And possibly many, many more.)
Rounding out the list, Plus subscribers can also save on the remake of Karateka ($5.00), a procedurally-generated shoot-'em-up called Big Sky Infinity with PS3/Vita cross-buy functionality ($5.99), and the exploration-centric Knytt Underground ($5.00).