Mid-Game refers to rounds at the end of Medium difficulty and the middle of Hard difficulty, usually occurring between Round 41 and 80. Mid-Game is not typically relevant to Easy Game Modes due to the final round being set at 40. However, Mid-Game may still occur in Easy Mode in the case of Events and Challenges (or achievement runs), where the final round has been increased.
Compared to Early Game and Late Game, Mid-Game is often seen as the most important in terms of strategy and preparation, while also a proving ground for any defense. Round 59 forces the player to get towers that can pop Camo-leads lest they want their 150, 100, or 1 life gone. Round 63 notably tests a defense's ability to quickly and effectively deal with the three onslaughts of intensely packed and highly numerous ceramics before the next onslaught comes before the defense has finished the previous wave of ceramics. Round 76 checks the defense's ability to not only defend the regrow ceramics, but to clean effectively prevent a regrow farm from overwhelming the backline. Round 78 is similar to 76 but with a second ceramic wave that is entirely in camo, checking whether the player has built sufficient camo detection for the Late game.
In Alternate Bloons Rounds, Camo Regrow Fortified Bloons start to spawn on Round 62, Round 76 tests grouped MOAB-popping power, and Round 79 tests grouped camo-popping power alongside strong MOAB class bloons.
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