An interactive math book
Play your way to the AMC 8.
Spin slot machines, seat people around tables, slide fractions and drag triangles. Guess first, then check. Every problem gives you hints, a full solution and a video.
Pick a unit
Combinatorics
Count anything without listing everything.
10 chapters · 10 ready →
Algebra
Turn word puzzles into equations you can solve.
6 chapters · 6 ready →
Number Theory
The secret lives of whole numbers.
6 chapters · 6 ready →
Geometry
Angles, areas and shapes you can drag.
7 chapters · 7 ready →
Contest Strategies
Tricks for test day.
1 chapter · 1 ready →
Review
Problems you missed come back here, spaced out so they stick.
Contest simulator
Eliminate answers, plan your 40 minutes, catch silly mistakes.
Formula sheet
Every theorem card in one printable page.
Progress
Mastery map, weak spots, profiles and backups.