PS Plus members welcome new additions to Sony's free games in the Instant Games Collection: 'Outlast' and 'BioShock Infinite.'

'Outlast' is the first studio title of Red Barrels, the makers of 'Prince of Persia', 'Assassin's Creed', 'Splinter Center' and 'Uncharted'.

According to the game's webpage, 'Outlast' is "a true survival-horror experience which aims to show that the most terrifying monsters of all come from the human mind."

The game retails for $19.99 but has been confirmed to come to PS Plus members free of charge by February.

'BioShock Infinite', which retails for $59.99, is a first-person shooter game from Irrational Games that has bagged 85 editorial awards. Players assume the role of hired gun, Booker DeWitt in the game.

"He must rescue Elizabeth, a mysterious girl imprisoned since childhood and locked up in the flying city of Columbia. Forced to trust one another, Booker and Elizabeth form a powerful bond during their daring escape," reads PlayStations post.

Both games will join 20 other free titles such as 'Don't Starve (Console Edition)', 'DmC Devil May Cry', 'Dyad', 'Borderlands 2', 'RESOGUN', 'Binary Domain', 'ibb & obb', 'Poker Night 2', 'Shadow of the Colossus', 'ICO', 'Galaga Legions DX', 'UNCHARTED 3: Drake's Deception' (Single Player), 'XCOM: Enemy Unknown', 'LittleBigPlanet Karting', 'Urban Trial FreeStyle' PS Vita, 'Sonic & All Stars Racing Transformed', 'Oddworld: Stranger's Wrath' HD, 'WipEout 2048', 'UNCHARTED: Golden Abyss' and 'Gravity Rush.'

Sony is also offering other titles for a discounted price. To access the full pricelist, CLICK HERE.

Here are the discounted titles for PS3 and PS Vita:

PlayStation 3 Game Titles

BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien

Crysis 3

Deus Ex Human Revolution: Director's Cut

ENSLAVED: Odyssey to the West Premium Edition

F1 2013

Far Cry Blood Dragon

Lone Survivor: The Director's Cut (Cross Buy)

Pool Nation

Puppeteer

Rain

Rayman Legends

Tales of Xillia

The Wolf Among Us Season Pass

Thomas Was Alone (Cross Buy)

PS Vita Game Titles

Disney Epic Mickey 2: The Power of Two

Killzone: Mercenary

LIMBO PS Vita

Lone Survivor: The Director's Cut PS (Cross Buy)

METAL GEAR SOLID: PEACE WALKER

PIXELJUNK MONSTERS: ULTIMATE HD

Sly Cooper: Thieves in Time PS Vita

Soul Sacrifice

SPELUNKY (Cross Buy)

Stealth Inc: A Clone in the Dark (Cross Buy)

The Walking Dead: The Complete First Season

Thomas Was Alone (Cross Buy)

Velocity Ultra Vita

Worms Revolution Extreme