"Defense Grid 2 still has plenty to offer the tower defense genre, but it isn't quite as defining as the original was. The level design is still extremely strong and the addition of multiplayer adds an extra dimension. It just doesn't have the same impact as it did first time around and it's a bit disappointing that the only changes that come with the towers are slight modifications."
The Nerd Stash: "Everyone loves setting up killzones and laying waste to waves of enemies, so here are our picks for the best tower defense games ever."
It's also free to try on the mobile headset and Oculus Rift.
Tower defence games have become incredibly popular on iOS and Android devices over the last few years but they are also incredibly fun to play on your PC.
