Terraforming Mars Colonies is a small box expansion for Terraforming Mars.The game was a huge hit on its 2016 release and has been well supported since. It sits in the Top 5 games of all time on Board Game Geek, winning a number of awards. In the base game you manage a hand of cards, playing them into your own tableau to trigger effects. It’s very much an engine building game. Players compete to efficiently create plant life, oceans and raise the temperature on the planet. A game takes about two hours, and there’s quite a bit of luck of the draw. But its strong theme and varied strategies mean it has earned its plaudits.