Quick answer: A Game Number is a numeric seed used to reproduce the same Classic Solitaire deal. When the Game Number and relevant mode settings match, the starting card order can be recreated so you can replay the same deal, compare attempts or challenge another player under the same starting conditions.
A game number identifies the starting deal
Instead of saving a written list of all 52 cards, the game engine can use a seed to generate the same shuffle again. The visible Game Number is that seed in a player-friendly form.
The number is only part of an exact comparison
For this site, a fair same-deal comparison also needs the same:
- Turn 1 or Turn 3 draw mode;
- Verified Winnable or Random deal type;
- difficulty setting for generated winnable deals;
- Daily or regular context when comparing recorded results.
A matching number with different mode settings should not be treated as the same performance test.
Game numbers make replay useful
After a loss, replaying the same number removes the changing shuffle from the experiment. You can test whether a different King, foundation move or stock choice produces a better route.
See when to replay the same Solitaire deal.
They also make friend challenges fairer
A challenge link can carry the same deal settings so both players start from the same position. Time and moves then reflect differences in play rather than differences in the starting shuffle.
A game number does not describe difficulty by itself
The number is an identifier, not a human-readable difficulty score. Difficulty depends on the structure of the generated deal and the mode used. Two numerically similar seeds can produce very different playing experiences.
Game numbers are useful for debugging too
If a specific deal exposes an engine or UX problem, a reproducible number makes that issue easier to test. Developers can reopen the exact starting position instead of hoping the same random shuffle appears again.
Use the number when you want controlled practice
Random games are good for variety. Game Numbers are best when you want repeatability: study one difficult deal, compare personal bests, or share the same starting challenge with someone else.