Myth Defense is a free to play tower defense game that has in app purchases that range from $0.99 - $2.99 per item.
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Pro Lots of levels
With DLC it has a ton of levels to beat.
Pro Full game can be purchased through in app purchase
Myth Defense 2 is a free to download game but it does include a singular in app purchase that unlocks the full content of the game.
Pro Large maps
Plenty of room to build complex mazes
Con Appears small on phones
Myth Defense 2 is better played on tablet only as it is rendered pretty small and difficult to use on phones.
Con Towers are not balanced very well
Fire towers are useless and physical class towers are over powered