Prologue

Once you start the campaign, you'll be immediately introduced to General Steele and you'll have to defend the base from the surprise enemy attack. This is a tutorial stage so just simply follow the instructions provided.

All towers will be available in this mission so you should get the basic idea behind them. After building the necessary towers along the road, just kill all enemies to complete the mission.

You'll also be introduced to Tessa Sparks, your Chief Engineer. Tapping her portrait in the lower right of the screen will bring up the Upgrades menu where you can spend coins to upgrade your towers. She'll also give you a brief tutorial about upgrading so just follow the instructions.