You will command a horde of orcs that will build towers to defend your gems from the good heroes. You will need to build towers on tiles that have the same color so you will not be able to just build them anywhere you please. Each tower will attack a hero differently. Some will use arrows while others use magic. Once you have accumulated enough extra funds you will be able to upgrade your towers to the next level, although some towers can do this based off the experience they earn from attacking enemies. Every enemy that your towers kill will cause them to drop coins that are automatically collected but in some cases they will drop a coin that will amount to a higher value and you need to make sure that you click on that coin with your mouse to collect it.