1. Choose 2 main bows and Towers to upgrade, don't invest others to distribute the coins and crystals.
2.Level up your Mana Recover as high as you can, this makes you able to cast more spells.
3.Don't upgrade your bow's spells too soon, the arrows output the main damage. Upgrade your tower's spell, large range of attacks is much more important.
4.Watch ads if you're lack of funds.

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