Yet another reason to upgrade your Playstation account, Vessel is a deservedly lauded title that's now free to PS Plus subscribers. The hero is a humble scientist whose inventions have gotten the better of him. Locked out of his lab, he has to get back in and curb the havoc created by his "Fluto". The Fluto are remarkable creations, resembling giant starfish with legs, but with the texture of jellyfish. To make your way through the environment, you must operate steampunk machines, unlock doors and avoid dangerous objects. Much of the puzzle-solving in this 2D platform game involves liquid: You're frequently dragging vessels to water sources, turning on big taps to create the Fluto and activating water-powered machines. You can manipulate the Fluto and even create and destroy them when necessary. This is a fine puzzle game, complex, sometimes frustrating, always fair. strangeloopgames.com