Love playing a game that makes you feel smart? Or at least one that lets you blunder the space program worse than - a fantastic game of spacecraft creation that recently saw a surprise drop to free.

The game is normally $1.99 on mobile and $4.99 on PC, so "free" is a price that's incredibly hard to argue with. The game should have an instant appeal to fans of Steam's long-standing Early Access gem Kerbal Space Program, while at the same time providing a gentle first step for those who've been thinking about playing such games, but feared the genre's intimidating premise.