Classic RTS game Command & Conquer: Red Alert 2 is currently available for free via Electronic Arts' "On the house" scheme.
You get the full package, both campaigns -- Red Alert 2 and Yuri’s Revenge -- and it’s yours to keep forever.
The only "catch" is you’ll need to sign up for a free Electronic Arts account, if you don’t have one already, and then install EA’s Origin to download the game. But that doesn’t involve much more than providing your email address, and everything else is handled more or less automatically.
The Red Alert 2 storyline follows on from the first game, pitching the Allies and the Soviet Union against each other in a range of missions from small and stealthy to fast-paced, full-scale multi-unit battles.
There are also various smaller "scenarios", quick skirmishes which you can use to learn the game or if you’ve only a few minutes to spare.
Command & Conquer: Red Alert 2 is available now, although EA warns "On the House specials can appear and disappear at any time", so don’t wait -- go grab your copy now.