Line of sight

Line of sight indicator in BTD6, the tower in the middle of the map can shoot towards the cyan-colored region, but it is restricted from doing so in the red region, which is covered by the Bananite Crystals of the map. High Contrast and Color Blind settings are enabled for clarity.

Line of sight is a game mechanic in the Bloons TD series introduced in Bloons TD 6, this restricts the directions where towers can attack Bloons by the presence of map features.

This game mechanic is implemented in the following games:

• Bloons TD 6
• Bloons TD Battles 2
• Bloons Adventure Time TD

Mechanics

Regular towers

For most towers, the line of sight of is a sub-region of the tower's range circle where the tower is able to detect and attack Bloons whose hitbox intersect with it. Map features that can create line of sight blockers include:

• Terrain height: Every attack has a determined height value where it is shoot from in the tower's model, which in a 3D-enviroment corresponds to the Z-axis with positive direction is pointed towards the screen/player. Towers are able to see and target Bloons if the terrain where they stand from has a lower or equal height than the height value of the attack plus the height value of the terrain where the tower is standing.
• Walls and environmental objects: These are permanent map structures that completely block the sight of a tower and their presence is commonly used as way to increase the difficulty of a map.
• Removables: Some maps contain objects that act as line of sight blockers, but can be removed by paying a certain amount of cash.

Certain towers may also have the innate capability (or be granted by an upgrade) to bypass all of these line of sight blockers and have their line of sight being equal to their range circle, (e.g. Adora or the Guided Magic upgrade for Wizard Monkeys in both BTD6 and BTDB2).

[TODO: GALLERY OF EXAMPLES OF THESE MECHANICS]

Towers in this category will only attack Bloons if the following 3 conditions are true:

• Any area of the Bloon's hitbox is inside the range circle of the tower.
• The entirety of the Bloon's hitbox is not covered by a line of sight blocker.
• The tower is not prevented from attacking the Bloon by other factors (e.g. Camo property).

Flying towers

Certain towers bypass the line of sight mechanic

Differences across games

Prior to Bloons TD 6

Although the feature was not implemented formally until BTD6, certain maps in Bloons TD 5 contain tunnels which prevent towers from attacking Bloons if they are inside of them, for example, the map Monkey Lane contains two tunnels which smaller Bloons and protects them for a short period of time, but MOAB-Class Bloons are "too big" to enter the tunnels and will fly over them,so they can still be attacked.

Navigation

Attack mechanics

General Area of effect • Attack speed • Collectables • Projectiles • Soul suckingBATTD only Targeting Camo detection • Line of sight • Range • Targeting options Projectile mechanics Damage (crit • damage type) • EnergyBSM2 only • Movement • Pierce • Pushback Mutations/statuses Blowback • Damage over time (acid • burn) • Freeze • Grow block • Knockback • Slow (glue • permafrost • stun) • Vulnerable