Tower XP

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Tower XP, or Tower Experience, is system to unlock Tower upgrades in the Bloons TD series. In Bloons TD 4 and Bloons TD 5, tower XP is acquired from towers popping bloons, while in Bloons TD 6, each round completed gives a fixed amount of XP that is split amongst all towers.

Bloons TD 4

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Bloons TD 5

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Bloons TD 6

For each round $r$, the total XP given in a round is:

$\text{XP}=\{\begin{array}{cc}20r& \text{for }r\le 20\\ 40(r-20)+420& \text{for }21\le r\le 50\\ 90(r-50)+1620& \text{for }r>50\end{array}$

this XP is split among each tower depending on the amount of money spent on each tower. So if you have $19,000 in Ninjas and $1,000 in Dart Monkeys in your defense, 95% of the round XP will go to the Ninja and 5% of the round XP will go to the Dart Monkey