I am jonesin for a nice 2d/3d first person shooter like doom, doom 2, wolfenstein 3d. There are only two suggestions I won't take and those are hexen and heretic. Anything that is guns or futuristic will do. Any ideas?
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Quake is quite a bit advanced beyond Doom and Wolf3D so I'm not sure if you want it and I'm pretty sure actually that you should at least know the game already unless you've been living under a rock. Also, Unreal in a similar vein.
Also, since it's actually Doom's 20th anniversary today, you might as well try to hunt one of the many, many, MANY .wads for the actual Doom game, some of them being really damn advanced, there actually being an annual competition for rating them called Cacowards. In fact, there exist Total Conversions that pretty much create their own game out of the Doom Engine, such as Hacx (though I'm not sure how good that one is)
Final Doom mappack with TNT Evilution and Plutonia is also good and still id Software approved if you care for that.
Also I never heard the expression of "jonesin" but that might be because I'm the monkey and you're the cheese-grater, mate.
In addition to what Grif said, you can safely assume that this list has a lot of very palatable .wads. You might want to try out the modern ones instead of starting from the bottom since obviously the art of Doom mapping has really come around since the early days and many people consider the early entrants on that list as not having aged well. Though, I repeat, I am a fan of The Plutonia Experiment.
Oh, and also: Dark Forces series are very good FPS, being some of the best Star Wars games ever made.
Delver is a good Roguelike/Doom-Like with plenty of difficulty you could try and it goes on sale on Steam for pretty cheap. I picked it up for 2 bucks on the autumn sale and it's bound to go on sale in winter too.
Rise of the Triad Dark Forces - bolded because no one else gave this suggestion yet. It's really good, also Star Wars if that's your thing
Duke Nukem and other games that use its engine (Redneck Rampage, Blood - Shadow Warrior is too tryhard for me though)
Well first of all if you already own Doom then you're probably better off with a source port than the raw version of the game because it's just easier to run. Most .wads tend to make use of GZDoom (which is ZDoom with OpenGL) goodies though if you want the most pure vanilla feel you go for Chocolate Doom. Haven't personally used PrBoom+ but some people vouch for it. It'll make it easier on all counts while unlocking spiffy stuff you may or may not want to play with.
Anyway with GZDoom it's easy because you just download a .wad, drag it over the executable of the game and it asks you what do you want to run that with if you have more than one .iwad to choose (so like, Ultimate Doom, Doom 2, Final Doom, Heretic, Hexen, Chex Quest etc.).
So for instance you download UACLabs.wad, drag it over gzdoom.exe, choose Doom 2, choose New Game and it runs. Don't play UACLabs.wad.
Certain ports/versions (including the vanilla one IIRC) require you to use a -file name.wad command.
This might be a bit more modern than what you're searching, but if you haven't played those yet I'd reccomend Serious Sam: The First Encounter and Serious Sam: The Second Encounter. They very much live up to older shooters in terms of gameplay - you shoot first, then shoot some more and usually don't bother asking questions because there is always more to shoot at :P
Just avoid Serious Sam II, we don't like to speak about that one
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