Command & Conquer: Red Alert is the first of all the CaC game but it's the only thing that will get you into alternative II WW. We have here United Nations and Russia. You have chance to create totally different storyline. This part is about playing for the Allies. This is the truth hardcore strategy where you collect resources for building, creating units and destroying your enemy. The missions are very original, from invasions to classic base building. You can look forward to many surprises as well. The briefing before every missions was, in the time when was this game new, really revolution but it's still fine to watch today.
Running the game can be a bit problem, there are instructions in the download file but you can try DosBox as well.