What would be the best system for an XCom adventure.


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I have been playing XCom Enemy within it is brilliant and the background is excellent source for a campaign. The game, genetics, cybernetics, aliens, agents, new enemy faction (humans who want to use alien tech to rule the world).

Normally if I was going to run this as a RPG I would use GURPS, but I think Shadowrun would fit better.


Shadowrun was going to be my suggestion 8th. Have you had a look at the new edition yet?


Yes - I may use this as an excuse to buy it :-)

I think Hero lab has the new addition available as well.

While GURPS would be a more detailed and probably closer to what I want in some ways, Shadowrun will be quicker and easier to implement.

Silver Crusade

Pathfinder Adventure Path Subscriber

I'm pretty lazy and would probably use True20.


Hero Lab has it already... will have to look into that. I splurged and bought myself the limited edition book for it, haven't had a chance to have a proper dive into it yet though. Looking at running a game early next year if I can get a group together.


Cyberpunk 2020/Interlock. The combat (as that's the primary focus of X-Com, let's face it) is solid and deadly. Very deadly. Mostly Class-Free character system, solid rules for armor (including staged penetration mechanics), cybernetics, and psychics can be folded in without much trouble at all.

I actually have rules for an X-Com style game using that system around here somewhere, I think. Lemme see if they survived the Great Data Crash of 2012.


I happen to be working on this at this very moment!


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This is the basic idea for my pitch:

I am not going to tell the players that it's XCom.

How would you guys like to play a modern day slightly supernatural game. I would like you to think of a character concept that would get you out and about, like a field archaeologist, CDC field scientist, A doctor from medicine sans frontiers, military, smuggler, I would alow people to be slightly psychic - suggestion, hunches and so on.

Then if I had time I would do a troop (one person playing their character and the others playing NPCs) style recruitment into XCom scenerio for each of the characters. Minimising the Alien involvement - hinting at a threat to humanity but from an unknown and "supernatural" force.

Slowly I would dripfeed the aliens and the set up of XCom. They would become an investigative team rather than a first response unit.


You could use d20 modern/future. It's probably going to be pretty easy to fit right out of the box.


My choices (best to worst) would be...

New World of Darkness (with Dogs of War, Armory, and perhaps even Hunter when they're more powerful, as supplementals)

d20 Modern/Future

Shadowrun 5th Edition

I rank Shadowrun as the weakest contender because it both requires the most modification from it's core assumptions (drop extra races, avoid cyber/bio at start of play) and it tips your hand that you're going somewhere crazy with it.


Personally, I'd use GURPS for this sort of game. GURPS handles a wide-range of skills and variances in Tech Level, and can be scaled in power level with relative ease.

(GURPS falls down if you try to use it for 4-color super heroes, but is otherwise very flexible).


If you're willing to do the groundwork involved, i think GURPS/HERO would be the best for it. (i'm biased towards HERO, but am happy to include GURPS as a choice. I've got no enemies in games.)


Delta Green? (Also available on RPG Now.)


It would appear that the Cyberpunk 2020 X-Com ruleset I built a while back did, in fact, fall prey to the Great Data Crash of 2012. Which is a shame, considering that you can use out-of-the-book weapons for nearly every piece of armament in any X-Com game (up to and including Blaster Launchers).

So, I can be of no help in that regard, I'm afraid.

Warning: Sad attempt at humor:

Ramarren wrote:

Personally, I'd use GURPS for this sort of game. GURPS handles a wide-range of skills and variances in Tech Level, and can be scaled in power level with relative ease.

(GURPS falls down if you try to use it for 4-color super heroes, but is otherwise very flexible).

Come now. As we've seen, no one actually plays GURPS


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jemstone wrote:

It would appear that the Cyberpunk 2020 X-Com ruleset I built a while back did, in fact, fall prey to the Great Data Crash of 2012. Which is a shame, considering that you can use out-of-the-book weapons for nearly every piece of armament in any X-Com game (up to and including Blaster Launchers).

So, I can be of no help in that regard, I'm afraid.

** spoiler omitted **

Your spoiler did make me laugh, FWIW. ;)


Victory! :D


I created a Starcraft d20 campaign and it worked brilliantly. I created 4 characters to form a tactical squad of men and the players had to pick which one they were.

I looooooved the burst fire rules from Dragonstar. They worked so well and I got tons of compliments on how smooth they played in with the system. Basically you roll to hit once and for every 5 you exceed the target's AC, you get another hit (up to the amount of shots bursted).

As a big fan of XCOM I would recommend these burst fire rules to you. Look into Dragonstar's autofire rules as well.

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