Square Blue

Square Blue is the first Defense in ScrapTD and unlocked by default.

Strategical use
Square Blue seems rather slow compared to Defense 2, but their bullets deal the same damage. The only good use of Square Blue is before the second Defense can be brought. It's suggested to spawn Circle Blue at the beginning until this defense is purchasable, then just place two on the field and they should be able to beat the first barrel. With 3 or 4 of them they should be able to beat Square Pink too if they aren't underleveled. When Banana Hole appears, Square Blue gets rather useless.

Trivia

 * Schrottii gave the name "Square Blue", inspired by the first barrel, Circle Blue.