Once you have 30,000 money and 40 towers, it asks you if you want to activate the monkey temple. If you say yes, then it takes away 40 towers (I believe the 40 oldest) and 30,000 money. Then that monkey head on top of the temple acts like an ultra sun god with a range that covers the whole map.
It is cool to see, but it asked me when I had exactly 41 towers and 32,000 money, so all I had as defense was the monkey temple, and one wizard or something - I died within 2 levels, so it is not as powerful as the towers it replaced...Try to have plenty more than 40 towers when you hit 30,000 money
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Save a game on the regular BTD4 and then resume the game on BTD4 expansion. Play a few levels. Save it and then resume it on the regular BTD4. It should be a different track with the towers in the exact same area.
It is not possible for BTD4 expansion or BTD4 to be hacked. However, I found a cheat that requires rank 32 and BTD4 expansion but only works in BTD4
This only helps you place towers on the track. Select a tower, right click, and click where you want the tower. You can use this on any track in btd4.
in order to get sandbox mode you must be rank 26
5 red bloons, 20 blue bloons.