The Laser Cannon increases its pierce from 1 to 4 (6 with Powerful Darts), pops 2 layers, and converts the main attack to the energy damage type (can pop Frozen Bloons but can no longer pop Purple Bloons without support). In addition, the Laser Shock effect lasts for 2 seconds instead of just 1 second. Random projectile deviation remains at 8° each side.
Laser Cannon is suitable as an early mid-game option due to its decent stats and infinite range. It functions best on maps with straight lines so it can miss less. Try to keep in mind the fact that it is relatively weak early game as a low tier Dartling Gunner. It is used as a good stepping stone to Plasma Accelerator.
3-2-0 Laser Cannon is mostly preferred for maximum DPS and popping of Camo Bloons. This crosspath grants both camo detection and faster attack speed. Laser Cannon has decent pierce already, but with Powerful Darts it can reach its targets at further distances much sooner with increased pierce, which can make 3-0-2 Laser Cannon better than 3-2-0 Laser Cannon in some cases.
Because Laser Cannon pops neither Purples nor Leads, make sure to have support towers for those types so that Laser Cannon can struggle less against the two weaknesses.
Effective and cheap options include low tier Ninjas and Snipers.
Compared to Hydra Rocket Pods, Laser Cannon is better at hitting single targets and is overall cheaper. It also has the option to also get Powerful Darts to pierce through more bloons per shot while still being quite accurate overall, and has the benefit of being able to be upgraded to Plasma Accelerator.
22.0 (Compared to BTD5)
Cost of Laser Cannon decreased ($6000 → $4250).
Laser Cannon has less pierce (13 → 4).
Laser Cannon deals more damage (1 → 2).
Laser Cannon now applies Laser Shock effect onto damaged bloons.
Description changed from "Rapid fire laser blasts can pop Frozen Bloons." to "Rapidly fires much more powerful laser blasts that can pop Frozen Bloons."
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BTD6 Crosspathing (top path 2, bottom path 3)
3-0-2 Laser Cannon projectiles
Two Laser Cannons, one 3-2-0 and one 3-0-2
Laser Cannon projectile
The Laser Cannon upgrade in BTD6 costs $1750 cheaper than it did in BTD5.
Unlike the BTD5 version, Laser Cannon has a lot less pierce and no natural attack speed bonus, but it deals extra damage per laser and is much cheaper.
In one of the concept artworks for the BTD6 Dartling Gunner upgrade, the Laser Cannon's clothing was originally a red tight suit with goggles in a similar style to Tier 2 Glue Gunners.