Evidence library

Solitaire research and data

Explore PlaySolitaire’s measured win rates, hardest-games analysis and public gameplay methodology, with versioned data and clearly stated limits.

Measured report

Solitaire Win Rates

Explore versioned player results, sample sizes, uncertainty and the separate solver evidence.

Explore the win-rate report

Evidence analysis

Hardest Solitaire Games

See how measured results and solver evidence inform an editorial comparison of Solitaire difficulty.

Read the difficulty analysis

Public methodology

Solitaire Win-Rate Methodology

Review the definitions, cohort rules, limitations, corrections and reproducible calculations behind the report.

Review the methodology