Blue Laser

Blue Laser is the sixth and last Defense in ScrapTD and costs 200 bricks to unlock.

Strategical use
This defense gives a big help against ground enemies, it even can defeat the last ground unit (Mobile Delivery) when you got 10+ of them if both are at same level), it's usually combined with Defense 5.

Trivia

 * It cannot defeat Mobile Delivery when either Mobile Delivery is too high or Blue Laser is too low.