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The editor who added this notice elaborates: What does the thank you message say specifically?
The End
Screenshot of The End
Level № 50
Starting darts 9
Bloon count 260
Target pops 50 (19.23%)
Objects
×150
×54
×14
×42
×24
×24

The End is the 50th level in the Flash version of Bloons. Unlike most levels, the background of a blue sky is replaced by a thank you message on a red background.

Solution

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Just throw the dart to the visible Tack Bloon.

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