![[PC] GameSessions - FREE (if you play the game 5 minutes) - Tropico 4 - GameSessions](https://files.ozbargain.com.au/n/07/437107.jpg?h=25c46b50)
As with the previous Gamessions freebies: it is yours to keep forever if you play it for 5 minutes using the Gamesession client. You will also have the opportunity to buy a Steam key for the game for $6 (which you should not if you can wait as the complete edition has been cheaper than that before I think).
Enjoy!