The robot army is coming to steal your gems! Fend them off by building Fire, Ice and Physical towers. First, click a tower from the menu on the right to select it, then click an open space of the same color to build it. Once the robots get close, your towers will shoot automatically. You earn gold each time you destroy a robot. Spend that gold to add even more towers or upgrade them to bolster your defenses.

If you see a flag in a level, that marks the High Grounds. This means you can build any type of tower there and it will have increased range. There are also Mana clouds in each level. Building a tower in these locations will grant you Mana.

You'll also earn Mana over time, which you can spend on three powerful spells: Use the Green Axe spell to chop down any tree, use the Blue spell to increase your towers' fire rate, or use the Red spell to summon a meteor on top of the robots.

After you beat a level you'll earn XP and when you level up you get skill points. Use your skill points to unlock permanent advantages that carry over between levels. 

Now that you know the rules, it's time to build up your forces and defend the forest treasures!