C.H.I.M.P.S.

C.H.I.M.P.S. is a brand new game mode in Bloons TD 6. The abbreviation stands for "No Continues, no Hearts Lost, no Income, no Monkey Knowledge, no Powers, and no Selling", being "the true test of a BTD master".

Rules
C.H.I.M.P.S. is positioned in the Hard difficulty (but, instead of starting at round 3, starts at round 6 like in Impoppable mode), unlocked after completing Impoppable difficulty. Each letter stands for a certain rules and overall, the player is not allowed to:
 * Continue the challenge after they lose, meaning you cannot pay money to continue.
 * Lose any lives, only set to 1, similar to Impoppable
 * Gain money other than through popping bloons or getting money at the end of rounds. Banana Farms and other money generating towers become useless providing $0, and no extra money was received through any other means. However:
 * Before the 1.5 update, Monkey Town was able to give extra cash per bloon pop.
 * Before the 1.7 update, the mode did not give extra cash at the end of each round.
 * Currently, Obyn Greenfoot's Wall of Trees ability can give cash if bloons are captured.
 * Gain bonuses through the newly introduced Monkey Knowledge abilities and skill tree
 * Use Powers, such as Monkey Farmers, Portable Lakes, Monkey Boosts, Road Spikes, or Camo/Glue Traps
 * Sell their towers; towers are placed permanently and cannot be altered, except you can reposition them via Support Chinook. The Nature’s Ward Totem from Obyn Greenfoot cannot be sold either.
 * Even though not mentioned in the description, Premiums are not allowed to be used.

Trivia

 * The mode might be based on the common term NAPSFRILLS, which was commonly used in BTD5 that also have similar objectives, being unable to use agents, premiums, speciality buildings, farming, road items, lose lives, and sell a tower.
 * It was said by Ninja Kiwi that it is impossible to complete any expert track on this difficulty, due to the no selling, powers, income, 1 life restriction, multi lane paths, and the green bloons that come immediately.
 * This mode may be considered easier than Impoppable due to the cheaper prices of the towers.
 * In most easy tracks, it is also easy to win without the need of extra income capabilities, Monkey Knowledge, Powers, premiums (continues, cash injections, etc.), without need to do any selling, or having to lose lives.
 * On the other hand, harder tracks are a lot more difficult to do without any of the forementioned benefits.