Rounds (BTDB2)

Bloons TD Battles 2 Rounds
Rounds in Bloons TD Battles 2 are identical to even-numbered rounds in Bloons TD 6 (except for rounds 2, 5, 7 and 38 of Battles 2). At Round 40, the game enters Sudden Death mode. If both players have the same number of lives after Round 40 ends, both players will have their lives reduced to 1 and after round 50 all means of income generation will be immediately disabled, much like Deflation in Bloons TD 6. The only way Sudden Death players may retrieve money is by selling towers. Sudden Death lasts until either one of the players leaks a bloon or no bloons are left on screen (this includes player sent bloons.) Round 50 is the last round, but it will last indefinitely as long as bloons are on screen.

A new round starts either ~4 seconds after all AI bloons (i.e., naturally spawned bloons) have been popped by one player or 10 seconds after the last AI bloons have spawned. On certain rounds with very few powerful bloons (like round 20 and round 30), the 10-second gap is extended to 15 seconds. On round 40, the only way to progress (and enter Sudden Death) is for one player to destroy the ZOMG and its child bloons.

The length of each round varies considerably. Below are estimates of the length of each round (feel free to update). The following table gives the approximate length of time from the start of one round to another, with the minimum time assuming a player defeats all natural bloons as soon as they spawn and the maximum time assuming that the natural bloons go unpopped long enough that the round moves on. This table assumes values of ~4 seconds for starting the next round after popping the bloons and ~10 seconds for starting the next round after the last current bloon has spawned (15 seconds assumed for MOAB, BFB, ZOMG and BAD).