Don't forget that your bonuses stack. For example, if you're using Fairy Chanting don't forget to click your Tax Collection and get an immediate 30 seconds worth of Fairy Chanting level enhanced revenue. This is particularly effective with the Angels, when you can click one Call to Arms and then something like 6 Tax Collections.
The "Newspaper" problem comments always get downvoted because it's not a problem. Newspapers are your enemy. Newspapers are evil. Newspapers will suck your soul out through your left nostril. They take their coffee with cream and sugar, and lemon juice, and fresh cheese, and a bit of beef kidney. They are not friendly. They want *alls* of your money - *alls* of it!
Just a thought - perhaps the cost of the upgrade could be green if you can afford it and red if you can't. This way you could immediately tell if you could afford those 10 upgrades or only part of them. Just a thought.
I've played the final mission, The Dark Tower, several times now and won, but I'm not getting any stars for completing it and I can't move on to the Heroic and Iron challenges?
warzone815 - "Collect boss reward" give xp to those who helped someone else defeat a boss. If you didn't help that person in their fight against the boss, nothing happens if you click "Collect boss reward."
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 "Kingdom Rush"){kind=icon}
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Thanks for answering warzone's question! :) You are correct.