Close is a target priority, released since Bloons TD 5 Flash, and has been introduced to the rest of the Bloons TD 5 Generation ever since. It is the third target priority of the majority of the towers in the game. Towers set on the Close target priority will target the closest bloon visible within its visible range. For towers with on-track attacks, such as Spike Factory, they will target the closest region of track visible within their range.
In Bloons TD 6, some attacks are locked on Close. Many of these are those that utilize zone-based attacks, such as Ice Monkeys and Tack Shooters, as well as on-track attacks such as Bloon Trap. Attacks in BTD6 locked on Close include, but are not limited to:
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- BTD6 Tack Shooter
- BTD6 Ice Monkey without Cryo Cannon or above.
- BTD6 Bloon Trap
- BTD6 Glaive Lord's orbital glaives
- Wall of Fire's fire blaze with either no Guided Magic or Guided Magic without nearby bloons
Some attacks were previously locked on Close in BTD6. These included Phoenix and Lava Phoenix flames, and Ezili's MOAB Hex jumps. Obyn Greenfoot's Wall of Trees, Cleansing Foam, and Bloon Trap with Larger Service Area all default on Close but can change to any targetable location by use of Selectable Target.