Okay so your probably pissed at the fact that you need to pay for actual units (and also the lack of Steam cards and junk of that kind). So lets see what units you can get for free. Any info taken here can be applied to the Android & iOS version as well. 

本指南旨在为各位零充玩家提供全成就的玩（苟）法，就是不买任何dlc完成前两个世界所有战役以及boss区域。 （另：解救俘虏虽然也有技巧（下面会提）但主要看脸。。。像我这样的脸黑玩家只能靠肝了。。。） 

I am the #1 PvP player in the world for MSD. I'm here to help you get out of beginners hell and actually be competitive. Don't worry about the leaderboard most of the top 10 scores are just hackers, play for fun. 

Przystępnie i szybko jak zmaksymalizować bonusy oraz zdobyć osiągnięcia. 

Who plays this game still? I still play this game but I want to know who else still plays. :(