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 can make space for a tower by clicking on a set of trees and then clicking the green axe to cut them down. Make sure you have the right amount of mana to do that first!

You'll also earn Mana over time, which you can spend on two powerful spells: cast the Lightning to strike down opponents or cast the Red spell to summon a meteor on top of the robots.

As you destroy enemies, they may drop items. This can range from gold and mana to items you can use in battle such as scrolls to freeze enemies, shock them with lightning, or turn them into chickens to slow them down! Click on a scroll to use it. You can also get gold screws that can be used by clicking the piggy bank icon and selecting a power up that can help you in battle.

Keep an eye on the buildings in each level. You can upgrade them by using gold or mana to benefit you in battle.

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. 

After every three levels, you can challenge yourself to beat the previous levels in night mode. You will only be able to place towers in areas filled with light. 

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