I've actually played TFTD a very long time ago, 10-15 years ago. Not that far, but some. I don't even recall why I jumped to it from playing the first game, was it maybe related to me learning that the first game had the bug where it would always revert back to beginner difficulty level, so TFTD was the only X-Com game to play with some challenge? Or did TFTD have the same bug?
In X-Com, now I've researched everything I could, I have Avenger fighters and even have the option to go to Cydonia already now. Not sure if I just should go for it already now. I have about 20 pretty seasoned soldiers where I've weeded out the ones with bad PSI resistance (ie. the soldiers which seemed to panic or get controlled by aliens, I just sacked them as soon as possible and recruited a new one). I've even went to Cydonia once to just see what it looks like.
The only thing is that I've barely started PSI training in the game. I have two PSI labs ready so 20 soldiers have now had their first month of PSI training, and I also have some PSI amps. Anyway, I understood that in Cydonia you don't necessarily need PSI training nor PSI amps, as long as your soldiers are resistant to PSI?
While I am playing OpenXCom only on veteran level, I'm at the same time both addicted and exhausted with the game
I know that feeling :) Both games used to have some weird bugs, including one or two really game breaking ones, but those have been long fixed. There used to be one where if you researched a specific tech without having another specific item in your inventory, then part of the research tree would become locked, including techs you need to win the game :P
Yeah you don't really need mind control to win Cydonia, only good psi resistance. If you want to train one/two soldier's psi skills before you go to Cydonia then you could do a couple of reaction training missions. It's a bit of a bore, but will make the final mission a lot easier. Basically you have to look for muton UFOs and then kill all of them at the landing/crash site save a few. The remaining ones you then mind control (one by one) and move onto a square with a laser pistol, a few squares away from a firing squad of your own soldiers (some crouched + some standing behind them) all equipped with the basic pistol and two clips. Then just wait for the muton to snap out of the mind control. He should pick up the pistol and start firing at your soldiers. As long as your soldiers have that flying armour they should be safe (from what I can remember) and each will then react-fire to the muton's attack. The pistols do do a little bit of damage to the muton's tough armour, and will eventually kill it, so two/three mutons are needed. There's a limit to how much you can train the reactions stat this way during a mission, just like with all other stats, and it's about 3-5 I think.
The Cydonia mission wasn't that hard from what I can remember. I recall using MC a lot and simply shooting the whole base to hell with a blaster launcher. I'd like to try out openxcom myself one of these days, but I'm going to consider trying to do it without MC. It's my only real complaint about the game. It becomes way too easy once you can MC aliens, and in TFTD too :P
I started playing it on Veteran (instead of Superhuman) to kinda learn the ropes and later play it on Superhuman, but now I don't even want to think about replaying the game... At the same time though, I'd like to retry many things differently now with all the information I have, ie. what to research first, where to put and how many bases in the beginning, which facilities to build ASAP etc.
Perhaps that then makes TFTD idea because of the mix of old+new? :)