Sigma Series Spire

Levels 46–99 · sigmaSeries

A towering spire built one term at a time. Sum arithmetic and geometric series to reach the top.

Study Before You Play

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

Arithmetic Sequences

Find terms and sums of arithmetic sequences — the foundation of sigma series.

Geometric Sequences

Understand geometric sequences and compute their partial sums.

Exponent Basics

Powers of 2 and 3 appear constantly in geometric series sums.