A port that merges the first two classic games into one.
The idea is good, workshop support, new campaign, new survival mode, restored cut content... But it was left unfinished in an early access state for years, the development history is a complete mess, including literal unpaid interns. It has since been brought in line to a passable state but still remains rough around the edges.

Only worth a purchase on sale if you don't own the Classics yet, as it adds them to your Steam library (as separate executables) cheaper than buying them separately. Also, it's very ironic that the classic games are patched and run fine on modern systems without the need for Revolution at all.