Oddworld: New ‘n’ Tasty (PS4/PS3/PS Vita) – FREE
Explore ancient ruins, dodge carnivorous beasts and avoid trigger-happy hunting parties as Abe, the original Oddworld hero in this lovingly recrafted take on PlayStation® classic Abe’s Oddysee.
You need to be signed in to your PSN account. Then search for the game on the PlayStation Store via the Search Bar. It will come up as free. PlayStation Plus is not required.
Update: This seems to work for some accounts and not others. Could just be a glitch with PS+ or the store.
Credit goes to wgb on the SAGamer Forum for the tip.