Fewest Tower Type CHIMPS

Fewest Tower Type CHIMPS, or FTTC for short, is a fan-made challenge consisting of beating CHIMPS with the least number of tower types beaten. Heroes are banned in this challenge, as they are capable of auto-leveling. Fewest Tower Type CHIMPS is tracked in the BTD6 Index.

Strategy
The core intent of Fewest Tower Type CHIMPS is to stretch the potential to analyze tower type synergies with as few external types as possible. Depending on the difficulty of the map, this challenge can showcase either single tower type synergies or multi-tower type synergies for each stage of the game. In terms of value in the BTD6 community, it challenges players to rely on individual tower types to make the most of beating CHIMPS.

There are only a select number of tower types capable of starting the game while still possessing a decent camo detection upgrade for all stages of the game (prices on Hard):
 * Dart Monkey ($215)
 * Sniper Monkey ($380)
 * Monkey Sub ($350)
 * Monkey Buccaneer ($540)
 * Wizard Monkey ($430)
 * Ninja Monkey ($540)
 * Engineer Monkey ($485)

Of the select group of starting tower options that possess early-game camo detection, only Buccaneer-only CHIMPS can't solo from Round 6 to 100. Sniper-only CHIMPS can only be done on Logs due to the map's bare minimal length for a single Sniper start to work.

Many other more expensive or support-oriented tower types can be used in conjunction with these tower types in order to adequately beat harder maps. Popular examples include Alchemist, Glue Gunner, and Monkey Village.

Tips

 * Due to traditional FTTCs starting with only the base $650 starting cash, many of the more expensive options are excluded entirely for single-type CHIMPS unless more starting cash is provided to make it possible.

Trivia

 * The concept of FTTC was long-existed since Version 2.1, but it was never established formally by the BTD6 community until around Version 25.1.
 * Spactory-only CHIMPS and Super-only CHIMPS is possible on Logs when given their respective starting cash for affording their respective base tower costs.