Marathon

How to play

Start a run and work through available problem types in curriculum order. Each type begins at a beginner level and builds toward intermediate proficiency before the run advances. Your stored skill ratings do not determine the starting difficulty, giving each run a fresh beginning.

Ten lives, one run

You begin with ten lives. Incorrect answers cost lives, and lost lives do not regenerate. The run ends when you complete the available curriculum walk or run out of lives. Aim for steady accuracy as well as progress: rushing through familiar questions can leave fewer lives for later material.

Account required

An account is required to play Marathon and track your runs. The mode description is available to everyone. Choose Progression for practice based on your existing skills, or Foundations if you want a shorter arithmetic session that guests can play.

Example problem

5x + 3 = 18 → x = 3

Subtract 3 from both sides to get 5x = 15, then divide by 5. Marathon moves beyond its starting calculations as you advance through available skills.