Square Blue

Square Blue is the first Defense in ScrapTD. It's the first pursachable in the game and unlocked by default.

Strategical use
Square Blue seems rather slow compared to Defense 2, also weaker. 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 pursachable, then just place two on the field and they should be able to beat the first barrel. When Billboard appears Square Blue gets rather useless.

Trivia

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