Two PS Plus free games are set to enter Instant Game Collection this week.

Puppeteer and Surge Deluxe are two of the PS Plus free games announced for May and they will be available for the PS Plus members without any cost starting tomorrow, May 20. These PS Plus free games will be replacing the PlayStation 3 game, "Brothers: A Tale of Two Sons and PS Vita game, Unit 13.

Puppeteer, one of the PS Plus free games,  is a PlayStation 3 game created by SCE Japan Studio. Released last September, this platformer, according to Gamezone, "delivers a 'magical fairy tale experience with a sinistar backdrop all played out in a theatrical world.'

The gameplay, as posted on the site, reads: "you play as a young boy named Kutaro who finds himself carried away by the Moon Bear King to a black castle where he's transformed into a puppet. What's more, Kutaro then has his wooden head removed. Armed with a special pair of scissors to help, Kutaru attempts to find his head and make his way home."

Meanwhile, PS Vita owners will be able to get Surge Deluxe as another one of the PS Plus free games coming tomorrow. As described on US PS blog, Surge Deluxe is "an intense color-matching title and the critically-acclaimed puzzle platformer Limbo. The action in Surge Deluxe heats up quickly as you chain together color-coordinated blocks. The faster you move the more likely you are to be successful - taking too long means the pressure will build up in the pipes surrounding the screen and BOOM! Game over."

Moreover, ahead of the scheduled launch of "Wolfenstein: The New Order" tomorrow, PS Plus members can pre-order the title and get 10% discount.