Experience Points



, or XP, are a value to describe a player's progress in the Bloons Tower Defense games. In Bloons TD 4 and Bloons TD 5 it is awarded for popping Bloons. The player gets 1 XP point per 1 Bloon popped but the XP gained for popping bloons is not equal to RBE. For example, reducing M.O.A.B. to Ceramic Bloons takes 200 hits so 200 points to RBE but since it only registers as a pop, the player will only receive a single XP point. The player gets a new Rank when they reach certain amounts of XP.

In BTD4, the bar showing how much XP you had also showed how many more bloons you had to pop before you go up a rank. In BTD5, the information is shown as pop up message when the player hovers the mouse over the XP bar. Bloons also give less XP starting at round 71.

BTD6 Heroes XP
Heroes gain a fixed amount of experience each round. It does not matter how many Bloons they pop. The base heroes all require the same amounts of experience to level up whereas Captain Churchill requires twice as much.

Bold lines represent levels where it requires LESS experience than the level before it.

BTD5
This is how much XP the bloons give in certain rounds:
 * Rounds 1-70: Bloons give 100% XP
 * Rounds 71+: Bloons give 30% XP

The player also gets Tower XP in BTD5. It is gained by using the towers. The more towers of a kind are used the more Tower XP for the type of the tower is gained. Certain amounts unlock new tower upgrades for each tower. Final upgrades must be unlocked also by reaching a certain Rank, such as the Ray of Doom.The path 1 upgrades usually require less XP than the path 2 ones(An exception is Arctic Wind).

XP for tower = (RBE for round) * (sell value for tower) / (sell value for all towers)

BTD6
In BTD6, the XP-gaining structure is different. Instead of automatically unlocking upgrades, the player gets to choose which upgrades can be unlocked for a tower. Each tower has a different set of XP collections, and more XP can be generated by using a certain tower more often.

Unlocking a tower with XP requires the previous upgrade tier to be unlocked, so for example, Very Quick Shots cannot be unlocked unless Quick Shots is also unlocked.

To see how much XP is required for each towers' upgrades, please see each respective towers' pages.

XP in BTD4
The max rank is 94 by getting 10 quadrillion XP.

XP in BTD5
The max rank is 200 by getting 150 billion XP.

XP in BMC

 * See also: City Level

In this game, players gain various amounts of XP by doing any of the following Some upgrades and buildings require a certain City Level (similar to rank in other BTD games) before being bought. Once the player gains enough XP, their city levels up.
 * Capturing new tiles
 * Building facilities/buildings in their town
 * Buying upgrades for the towers in the upgrade buildings
 * Completing quests

Demolishing building leads to you being "in debt" to experience points. More research is needed to see what this does to your territory.

Tips

 * In BTD5, the player can replay the Daily Challenges Third Time's A Charm (July 2nd, 2012), The Daring Dozen (January 27th 2014) or 20 Ceramics on the Wall (July 30th, 2012) to earn millions of Experience Points.
 * In Freeplay Mode of BTD5, the amount of experience gained per popped bloon slowly goes down per round, gradually making it an ineffective way to gain experience.
 * More information about gaining Experience Points quickly can be explained in the Experience Point Farming article.

Trivia

 * In BTD5, the maximum amount of XP is 179,995,343,055,540,813,000, while the player is still at Rank 200 with that amount. The amount needed to go to the next Rank (with the maximum amount) is -179,995,343,055,539,813,000.
 * This is due to an integer overflow.
 * On the Daily Challenge 20 Ceramics on the Wall, the player can earn about 5000 XP by playing Rounds 1-70, then keep repeating to reach higher Ranks.