GOG.com announces a holiday celebration that sees them putting their entire Bethesda Softworks catalog on sale for 75% off, not counting games they are offering for free. Here's the deal on the deal:

With a new free game in our catalog: Bio Menace, something of a mix between the smooth and joyous gameplay of Commander Keen, and the alien weirdness of the original Duke Nukem platformers. The spacey 2D shooter by 3D Realms is now part of our selection of free, truly worth playing, classics.

With a Happy Holiday Sale from GOG.com & Bethesda:
Have a holly, jolly discount. It's the best time of the year. We don't know if there will be snow, but have a cup of deal. It's up to 75% off the entire Bethesda catalog on GOG.com - including the three and only classic Fallout games, as well as some of the best shooters in history: the retro Wolfenstein 3D & Return to Castle duo, The Ultimate DOOM, DOOM II & Final DOOM alongside the Quake series (from the singleplayer gory of Quake + Quake II, through the timeless mutliplayer mayhem of Quake III). Finally, there's the chance to explore the history of The Elder Scrolls with classics like Morrowind, Battlespire, and Redguard.

As always, any purchase from the Bethesda catalog on GOG.com comes with a free copy of The Elder Scrolls: Arena and The Elder Scrolls Chapter II: Daggerfall!