Soloed the Christmas Event.
Pretty lame though. They really needed to show monster spawns and the trees on the map in the build phase so you have some sort of idea what's going on. Plus when the boss wave comes it clears out all of your towers and gives you a minute to build... without any indication of where you want to defend.
I think I'll pass on getting back into the game, unfortunately.
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No amount of planning will ever replace dumb luck.