GOG.com announces they have kicked their DRM-free summer sale into overload for 24 hours, which includes additional deals and freebies. Here's what's happening:

It's the 2015 DRM-Free Summer Sale #DealOverload
An electrifying, energizing, jolting, shocking, galvanizing cornucopia of value!

We're celebrating the one and only #DealOverload with a 48-hour giveaway: The Kung-Fu themed real time strategy game Battle Realms is free! DRM-free gamers among us can share the summertime joy with your friends and family - the giveaway is open to everyone, with no strings attached and just one click away. All until June 11, 11:59 AM GMT.

But this special day brings not just a mountain of deals, but also two exciting DRM-free Telltale game premieres with GOG Galaxy support for achievements, auto-updating, game-time tracking and more:

The Walking Dead - A Telltale Games Series Seasons 1 and 2, as well as the standalone 400 Days episode, will be available in a bundle up to 75% off!
The Wolf Among Us sitting among Telltale's best-told adventures, the comic-book styled and inspired fantasy murder-mystery will also premiere DRM-free with a 75% discount.

Whether you're long time guest or a newcomer, there is still plenty of time to unlock up to three games for free. SimCity 2000, S.T.A.L.K.E.R.: Clear Sky, and Xenonauts await all those who spend $1, $20, and $50 respectively throughout the summer sale.

These are just the first of more surprises coming up during the 2015 DRM-free Summer Promo, which has 12 more days to go until June 21, coming to an end at 11:59 PM GMT (13:59 CET / 4:59 AM PDT / 7:59 AM EDT).