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As of —
30-day average
—No reading yet
Polled every 30 days
| Data | Collected | Observed since | Last success |
|---|---|---|---|
| News and patch notes | Every 30 days (dormant tier) | — | |
| Player counts | Every 30 days (dormant tier) | — | — |
| Store details | Weekly, and when Steam reports a change | 27 Oct 2026 |
Busier games are polled more often. Source: Steam Web API. Not affiliated with Valve.
Prove theorems by playing cards, just like in a game of solitaire. Your solution is checked by a real theorem prover. Sharpen your math skills by solving thousands of puzzles across six difficulty levels.

No price on the US Steam store for Theorem Cards: free, not yet for sale, or not checked yet.