The third and final roadblock is affording those highest tiers of tower and using the final duo to beat Rounds 81 to 100 without need of additional support. For purposes of completing the achievement and not for trying to challenge oneself in special 2TC challenges, assume non-hero towers are bought to their maximum as soon as possible and heroes are never manually upgraded until the other non-hero tower is max tier. Most of the time, this specific problem comes from attempting to beat Round 63, but sometimes Round 76 can be the source of the trouble. Some combos may be very powerful in combination once their highest tiers are afforded but cannot be practically done due to both towers having insufficient firepower to handle the mid-game prior to those higher tiers. The second roadblock is getting through the mid-game with the intermediate tiers. Beating key rounds such as Round 24's Camo Green, Round 25's Purples, Round 28's Leads, and Round 40's MOAB are among many roadblocks during the early-game. Getting through the early-game can also be an issue, but not as problematic as the first few rounds. The first roadblock comes from choosing the right starting tower, which for $650 cannot offer much. And lastly, 2TC should be done on a Beginner Map for the best results 2TC on Intermediate Maps is entirely possible but never recommended. Usually, the late-game will be the most difficult part of this challenge, but occasionally the beginning can be very difficult too. Secondly, the second tower must be strong enough in combination with the first tower to combat the early-game weaknesses and possess enough firepower with its intermediate tiers and final tiers to counter the mid-game and late-game. Firstly, the first tower (and therefore starting tower) must be purchasable in the first round with $650. 2TC requires precise strategy by selecting two different towers that can beat all stages of the game.

Bloons tower defense 6 chimps