“ | That was too easy, press 'Start Round' to play the next round. | ” |
~ BTD1 Pre-Round Comment on Round 2 |

Round 42 in BTD5 Easy Difficulty.
Rounds (also known as levels, waves, or stages) are the levels in the BTD series. Rounds normally consistent of a pre-determined number and order of Bloons. Each round generally gets harder as the player progresses, and rounds in Freeplay are often randomized featuring heavy MOAB-Class Bloon rushes.
The counter for Red Bloon Equivalent (RBE), premiering in BTD4 and then later disappearing in BTD6, shows how many pops to finish a round. Pre-Round Comments may appear before a round.
The classic games are finite and completing all the rounds will send the player to a congratulatory message. From BTD4 and after, there is a definite point where all subsequent rounds are randomized except possibly a few select exceptions and a round limit inaccessible in normal gameplay.
List of Rounds[]
For a full list of rounds, refer to the following pages:
- Rounds (pre-BTD5) (Bloons TD 1 to Bloons TD 4 Rounds)
- Rounds (BTD5) (Bloons TD 5 Rounds)
- Rounds (BMC) (Bloons Monkey City Rounds)
- Rounds (BTD6) (Bloons TD 6 Rounds)
- Rounds (BATTD) (Bloons Adventure Time TD Rounds) [under construction]
- Rounds (BTDB2) (Bloons TD Battles 2 Rounds)
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