"Cthulhu saves the world" :)

Grab a copy of MAME and fire it up. A buddy and I played Rampage, Gauntlet II, Twin Tigers, Karate Champ, and a whole crapload more 80s arcade games with MAME on a retro arcade party weekend years back. It was pretty fun. :)

Evil games that haven't been mentioned already, hmm...

Neverwinter Nights 1: Hordes of the Underdark - I love the LE ending to HoTU so much, it's not even funny. The main NWN campaign is kinda blah for evilness.

NWN 2: Mask of the Betrayer - The evil path on this is absolutely fantastic, and there is no way in hell I am going to spoil it. Just go evil, and then keep going. The main campaign for NWN2 at least has a more respectable evil ending than NWN1.

The Bard's Tale - Has an evil ending and I like it.

Mark of the Ninja - Kind of. You definitely have more of an evil vibe than in Assassin's Creed II. I think when you start staging corpses to terrify guards into shooting each other you kind of cross the morality event horizon.

Age of Wonders: Shadow Magic - Play as the undead, as goblins, as orcs, as dark elves, or my favorite as insectoid shadow demons that enslave, consume, and destroy everything in their path.

Heroes of Might and Magic III - Quite a few of the campaigns are just straight up evil, as well as any time you play Dungeon, Inferno, or Necropolis.

Expeditions: Conquistador - Well, if you play it historically, then you likely come off as the villain. I'm not sure what else to classify a team of raping, pillaging, slaving, murdering invaders as. This game gets a lot of respect from me for treating these topics very maturely and touching on the flaws, reasons, and instinctual reactions at the time.

Honorable Mentions:
Brütal Legend - You are technically the good guy. In a brütal metal hellscape though, everything rests on how badass you are. Fuck good and evil; be awesome.

Geneforge Saga - It depends on how you feel about the Shapers and later on the other factions. I really like Spiderweb games for their lack of a cleanly defined good and evil.

In Eador: Genesis (and probably Masters of the Broken World) you are able to play evil (the objective is to conquer each shard anyway). I never tried it, it might be hard because of the unrest level in the provinces, but it might be not too hard with necromancy.

Breath of Fire IV, Fou-Lu scenes are playable and highly remarkable, that is a damn fine badass, for a damn fine game..

Hotline Miami perhaps.

One could say Postal, however, in the first game it's clear he has a mental sickness, and I feel like that doesn't make him a bad person. Even though he does some truly horrible things. In the second game you have a choice of being a bad person.

In Manhunt, it's clear James Earl Cash is probably a pretty terrible person, since he was put on Death Row. What's interesting about that game though is it pits a bad person against absolute sick fucks, and somewhat forces you to sympathize with the lesser evil person.

In pretty much every GTA you play a criminal, only out for themselves.

Kane & Lynch are also pretty awful people, ruthless criminals.

Someone said C&C, which I would argue because while the Brotherhood of Nod are pretty shady, GDI can be just as shady. I like how there is no clear good guy in those games. However in Red Alert the Soviets are dicks >_>

Overlord, Syndicate and Dungeon Keeper have you playing the bad guy. Counter-Strike lets you play as terrorists :P

Black & White lets you turn your creature evil and terrorize the people.

In Blood you play an anti-hero, Caleb. He used to be WITH the bad guys until they killed him, now he's completely out for himself and will happily gun down anyone in his path.

There are so many games that let you play the "bad guy". "It's good to be evil", right? :)

Postal to a degree, via my own interpretation, even though he's antisocial his acts cannot be justified, he had a choice, and he chose to do harm and blame everyone else for his own shortcomings. So he's a despicable character, but he's also not mentally well either, so you can't just say he's evil so much as a loose cannon with sadistic tendencies.

E: He's also the most realistic, and scariest character, via the first game, as he could of been any one of us at one point, but instead of channeling his chaos into something creative and non-harmful, he decided to unleash it onto the world instead through the brute force solution. His demon got the best of him during a dark time.

What JKHSawyer said about Postal 2. When I play I am always an evil prick and I relish in causing havoc in others' lives, I also make it my goal to murder as many people as possible per area until the spawns are reduced to just the odd cop or two.

Manhunt's Cash is a shitty person for sure, he doesn't seem to care about others (telling the Reporter to have a nice life) except maybe his family, despite they weren't close, he wouldn't want them to get involved in his BS. Similar to Postal you're in an unholy alliance with him, except in Manhunt it's against even worst people, so you don't have a choice but to do whatever you can to survive.

Kingpin's unnamed Thug, he's a scummy person dealing with scummy people in a scummy world, there's no one to like here, pure vitriol, I like it when it's grimdark like that in a game. Hopeless.

Blood's Caleb is my favorite anti-hero and the first one I played in any game growing up (besides Max Damage in Carmageddon but Caleb had more personality) as he's a bad guy through and through but his enemies are the really evil ones, so it's bad vs. evil, my favorite type of stories. Blood II has a stronger emphasis on this with remarks from other characters such as Ophelia's line "We are bad, you are the other, there is no good."

TIckets please! ... TIckets please! ...

Hey! Hey! He didn't pay!

:)

People don't need God to terrorize each other. Plenty of Atheists out there doing the same shit. Stop peddling isms. It's the only way to reach nirvana! Haha! What an oxy moroon!

Master of Magic
Master of Orion (I & II)
1830: Railroads & Robber Barons

Star Trek: 25th Anniversary, in which you can make Kirk say and do things that only a blue-blooded imperialist would consider. Mind, Starfleet would ding your evaluation for doing so...

Oh! I forgot Enclave, that has a fun path.

In pretty much any open world sandbox game people tend to act like psychopathic massmurderers.

Also i wouldnt want to like to run to the protagonists of Prototype 1 and 2.

The ng+ demon route in Soul Nomad.

Though I just started the game yesterday.