Complex Numbers Citadel

Levels 51–99 · complexNumbers

A fortress beyond the real number line. Add, multiply, and find magnitudes of complex numbers to unlock its gates.

Study Before You Play

Brush up on these topics to sharpen your skills for this zone.

Imaginary & Complex Numbers

Discover numbers beyond real — learn i, complex arithmetic, magnitude, and conjugates.

Complex Numbers

Explore the complex plane, operations on complex numbers, and their geometric meaning.

Squares & Square Roots

Understand perfect squares and how to find square roots.