Featured Game: Gem Tower Defense

Gem Tower Defense is not your typical TD game. There are a few twists to work around here:

• You can't pick what type of tower you want to build. You place five randomly selected towers per turn, and then choose one of them to remain, while the rest just turn to wall pieces.
• Towers level themselves up, according to how many kills they have.
  
• You can combine certain stones to create special towers with enhanced abilities which can be upgraded.
• Enemies have to hit certain pre-designated points to continue through the maze. You can't build on top of these points, and you can't completely wall them in.
  

There are a few other atypical features, but I'll let you find those yourself... ;)