[stoneforger]

Of the games you mention it's civilization that's kind of hard to replay for me. RR tycoon had fewer, worse, iterations. All Xcom games are super replayable with the exception of Xcom 3. Colonization is super replayable and it's only reiteration based on Civ 4 is not worth it.

[spockz]

To this day I’ve managed to win in every civ game but still have to figure out how to consistently beat Colonisation.

[fakedang]

XCOM 3?

[CyMonk]

The third game in the series is "X-COM: Apocalypse".

https://en.wikipedia.org/wiki/XCOM