Trivial Difficulty

The Trivial Difficulty, also known as Very easy, is the simplest difficulty in Bloons Monkey City and Bloons Monkey City Mobile. A tile with this difficulty is represented with one green dot. This can sometimes become a nuisance due to its fewer XP gained from the tile. However, completing such a tile will still gain at least some City Cash but the same amount of Bloonstones, and also still counts towards Events and the earning of Monkey Knowledge Packs. Attempting to attack any of these tiles results in the player getting a warning message, asking them if they want to skip it or not. Skipping such tile gives no XP, no Bloonstones, nor Monkey Knowledge Packs, and rewards only the City Cash normally gained from it, including any extra Cash or Special Item from it if said tile had a treasure chest, and it instantly captures the tile without the need to fight the Bloons. Not skipping would proceed to the map as usual.

Table of times before Trivial
Trivial tiles are nonexistent when the city is first created; they will only appear if one keeps an Easy tile within the map until they reach a certain level. Up to MOAB (BFB on mobile due to the fact you can go past Level 40) tiles can be trivial. Though Assaults may never be trivial in BMC Flash, any BMC Mobile tiles even with any form of assault can be trivial.

(Note: Superjombombo found a trivial MOAB Cave Terrain while at Level 39).

Trivia

 * Trivial Difficulty tiles gain only half the XP that it would for any other difficulty.
 * In Bloons Monkey City Mobile, Trivial tiles that only have reds cannot be skipped, likely to prevent the player from avoiding all battles completely to claim tiles (as the player needs to learn to place towers and fight bloons), since these tiles are the easiest tiles to beat. This also applies to the Caves and Volcano Terrains, and when capturing Trival tiles that have the Bloon Beacon. However, trivial tiles that have Treasure Chests can be skipped, as mentioned above.
 * Despite skipping the tile, the player would still receive the "Victory!" message.
 * In BMC Mobile, after skipping, if the player did not make an IAP in game to remove forced ads, they would not see interstitial ads, as the player had not entered battle.
 * Although the difficulty is not shown before attacking Special Terain tiles, they can be marked as Trivial, but the mission cannot be skipped nor does it have decreased reward. This dubious marking of "trivial" to Special Missions may be a glitch in the tile-determining difficulty system.