Recursive Realm

Levels 48–99 · recursion

A looping dimension where each answer builds on the last. Compute terms of recursive sequences to escape.

Study Before You Play

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

Recursion & Recursive Sequences

Understand recursive definitions and compute terms of recursive sequences.

Special Numbers & Sequences

Explore Fibonacci numbers, Lucas numbers, and other remarkable recursive sequences.

Sequences & Patterns

Arithmetic and geometric sequences are the simplest recursive sequences.