As part of Sony's Days of Play promotion, the company is releasing a series of bonus PS Plus games, and the latest two give PS Plus Premium a boost with the addition of PS1 adventure titles Myst and Riven.
Myst is the original and Riven is the sequel, but both are first-person point-and-click adventure games.
"Journey to Myst Island and other stunning, long dormant locations — called “Ages” — and begin to unravel the mystery you have been thrust into," is how the Steam page sets the first game up. If you wish to buy them standalone, they’re £4.39 each.
"As you learn what happened on the island, you will find that you are playing a key role in an epic story whose ending has not yet been written. Explore deeper connections in these stunning and surreal Ages, uncover a story of ruthless family betrayal, and make choices that will affect both you, and the world of Myst itself."