Bloons Tower Defense Impersonation/Main Gameplay

Like previous iterations, BTDI features the gameplay of purchasing and placing down towers to pop the enemies, known as bloons. Likewise, each game progresses via rounds, which often gradually introduce more difficult bloon types to the player and become progressively harder.

Before starting a game, players are prompted to choose a difficulty—Trivial, Easy, Medium, Hard, or Impoppable. The grand selection of game modes in BTDI allows players to play the same track in many different ways, thus making the game itself more diverse than previous installments in the Bloons Tower Defense series. Upon completing a game, players will be rewarded a certain quantity of Monkey Money determined by the difficulty and mode of the track chosen. After a track's first completion on a difficulty, the amount of Monkey Money rewarded upon re-completion of that same difficulty is significantly reduced.

All bloons from recent previous iterations, including M.O.A.B.-class bloons such as the M.O.A.B., the B.F.B., the Z.O.M.G., the D.D.T., and the B.A.D., return in BTDI, along with new M.O.A.B.-class bloons known as the A.I.E. and the E.V.I.L.

BTDI introduces countless new game mechanics such as Orange Bloons, which are immune to fire-based attacks, Blubber Bloons, which must be popped by sharp-based attacks, Weighted Bloons, which take multiple hits to pop and have immunities to explosives and sharp-based attacks, many new heroes, many new towers, many new bloons, many new tracks, new game modes, Tier VI upgrades, several new properties, including Shielded and Zombie Bloons from BATTD, and many more.