Change

A change (symbol: ) is a term that is used to describe a balance change that describes neither an objective buff or a nerf. It is often a rework that has greatly modified the tower such that it becomes stronger on one end and weaker on the other. Most of the time, a "change" is a mix between a technical buff and a player nerf.

The first established "change" is the rework of Larger Service Area in BTDB Mobile during 4.6 by reducing its range. In that example, its range was decreased, which technically a nerf but is an overall buff in favor of the player. Hence a "change".

Definition
By convention, a "change" refers to balance changes that inconclusively changes utilization of a game mechanic to the player's advantage. It is often a rework of a tower with a questionably "buffed" or "nerfed" outcome depending on perceived strategy style. If a very specific strategy style has been clearly improved/worsened by a balance change, then this balance change is considered a "buff"/"nerf".

Formatting
On Bloons Wiki, a "change" is marked with a Yellow Bloon with a grey equals sign, plus following text that describes the change.

Simple example:
 * UpgradeName now  

Refer to the documentation for Template:Change for further details.

BTD6

 * Overclock rework in Version 21.0 had modified how the buffs work, going by a tier basis rather than a price basis. In essence, it is overall a nerf due to the nature of Overclock designed to be targeted onto single powerful towers rather than single weak towers.
 * Super Glue rework in Version 8.0 increased its on-hit blimp damage from 0 to 50, which is a technical buff but is a big nerf to stalling strategies.
 * MOAB Shove adds a missile attack starting from Version 28.0, which in terms of pure damage is a straight buff but its stalling power is reduced substantially.