While not the all time lowest price this is the best recent and current price for this classic (and hectic) shooter. The all-time low price was size (!) years ago.
Serious Sam Double D XXL: https://store.steampowered.com/app/111600/Serious_Sam_Double…
From the website: Serious Sam Classics: Revolution
Serious Sam Classics: Revolution is a unified version of the Croteam's original Serious Sam Classic: The First Encounter and Serious Sam Classic: The Second Encounter experiences. The game started to be redesigned by Alligator Pit, an indie development team made of Serious Sam fans with support from Croteam, but it was “on ice” for a while due to life happening to Alligator Pit team, so recently Croteam took over the EA development and made it to the finish line.
On top of everything available in Serious Sam Classics, Serious Sam Classics: Revolution includes additional enemies and 8 brand new campaign maps, including an epic new boss you can scrap with. Revolution is powered by an updated Serious Engine 1 featuring all-new advanced graphics shader support, full 64-bit compatibility, and Steamworks integration.
Serious Sam Classics: Revolution is a standalone product and it is completely free to owners of original Serious Sam Classic games on Steam (Serious Sam Classic: The First Encounter and Serious Sam Classic: The Second Encounter).
KEY FEATURES:
- Become Sam “Serious” Stone - Travel through beautiful landscapes of Ancient Egypt, Mayan Civilization, Persian Empire and Medieval Europe. Confront countless members of the Mental's horde hell-bent on destroying the human race.
- Frantic Arcade-Style Action - Fight against Mental's nightmarish warriors, including old favorites like the Beheaded Kamikaze, Sirian Werebull, Kleer Skeleton and forgotten baddies that somehow got lost in time. Battle it out with three of Mental's fiercest generals to save the day or die trying!
- Special Weapons and Power-Ups - Wreak havoc with a huge arsenal of weapons including the classics such as the Double Shotgun, Minigun, Sniper Rifle, and Cannon! We also added the beloved Plasmagun and Minelayer from the Warped mod!
- Full Steamworks support - with Steam powered servers, game browser, achievements, leaderboards, and more!
- Friends and Enemies - Embrace the chaos of true online and local cooperative and versus multiplayer modes (split-screen included!). Jump in for some classic versus action in Deathmatch and Scorematch. When you've had enough of that, try out the all-new game modes unique to Revolution - Team Deathmatch, Capture-the-Flag, Control Zone and more!
- Survival - Try your luck at the brand new Survival game mode!
- Discover over 100 secrets spread throughout the battlefield!
- Powerful Editor - Create your levels, mods, textures and other content with the inclusion of the fully featured Serious Editor and the Serious Modeler!
From the website: Serious Sam Double D XXL:
Serious Sam explodes into the second dimension using everything in his arsenal to battle the abominable legions of Mental’s horde. Pull the trigger to let the heavy ordinance fly in Serious Sam Double D XXL, a completely reloaded version of the indie sensation Serious Sam Double D with all-new missions, weapons, enemies, and challenges. Pile on the firepower with the revolutionary Gunstacker and fire all your weapons at once in a symphony of destruction! All that stands between victory and annihilation is a man in a T-shirt and jeans wielding a great big pile of guns.
Key Features
- Serious Action: Unleash a storm of bullets and flame against an unrelenting horde of bizarre and ferocious creatures hell bent on bringing down the heroic Serious Sam. Clash against Mental’s army across 18 levels in three sensational worlds from the pyramids of ancient Egypt to the volcanic chaos of Pompeii to the harsh jungles of prehistoric Earth.
- Revolutionary Gunstacker: Duel-wielding is for lesser men. Serious Sam Double D’s new Gunstacker allows Serious Sam to stack any combination of weapons one on top another and fire them all at once. Two shotguns on a laser gun and grenade launcher? Of course. Four chainsaws and a flamethrower? Yes, please.
- Legions of Bizarre Beasts: Clash against classic Serious Sam enemies like Headless Kamikazes, Gnaar, and Biomechanoids or gun down all new monstrosities like the insane Chimputees, oddball Vuvuzelators, and the surprisingly sexy Femikazes. Prove your worth and take down four amazingly unique bosses in epic showdowns full of carnage!
- Challenge Rooms and Serious Secrets: Keep the action coming with a battery of action-packed challenge rooms filled to the brim with waves of attacking beasts! Get really serious and try to uncover dozens and dozens of secrets hidden throughout this wild world!
Enjoy!