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.
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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.
you can play bloon tower defense 4 hacked at hackedonlinegames