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There should be a special tower to attack ninjas while invisible. This tower will be unlocked after having 20%+ skill points of Demons Tower (Temple). Then our meteors can be used for heroes 'cause meteors is mainly for heroes. But for the ninjas, we have to use meteor and reduce our mana. And when heroes comes to take the gems of us, we're doomed! And if the hero is a ninja........... we're finished! It's very hard.
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Spoiler: To those who find it hard to get Brilliant on L14(because of the ninja boss) -Max out the Mana Pool, Mind Control and Ice Mastery spells. -Place Crypts(snow towers) on the high positions near the entrances and make sure they max out as Fearful Towers before the final wave(ninja boss) -Place Dens at shooting distance from the entry points and upgrade them to Ballista Towers. DO NOT PLACE ANY OTHER(ESPECIALLY LOW LEVEL) TOWER IN SHOOTING DISTANCE FROM THE ENTRY POINTS -Keep the Meteor spell(with Meteor Study and Meteor Mastery maxed) at the ready with mana max at 500 for the ninja boss Tip: If you have maxed out Cut Down Study and Cut Down Mastery, then you can keep cutting trees to fill your coffers, making sure there's always just enough mana for a couple of meteor strike in case assassins or ninjas get too close. If you find this helpful vote it up and keep this comment on the top for others.
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Great tower defense game. One can solve all the levels with correct tactics and boosted skills.
I like Curse Treasure 2 even more.