Practice guide
Learn the 64 facts
Four mental-math moves, worked examples, and a recall drill in both directions.
Mental multiplication
Prime Factor 64
Practice the same 64 multiplication facts in two games. Revisit missed facts in Prime Factor 64, or learn the patterns in the guide below.
Expression
Result
13 × 17
221
Read and practice
Project history
How we built Prime Factor 64
The design and technical history, from the first matching boards to practice across sessions.
Project history
How we built Fog Sweep 64
From the two-board prototype to progressive reveals, round reviews, and the final fanfare.