Determinism

The same runtime inputs must produce the same puzzle. Those inputs include the seed/date, runtime configuration, selected theme, rule versions, and relevant generation configuration.

Determinism supports:

• Replaying a player’s puzzle.
• Comparing benchmark runs.
• Building historical snapshots.
• Diagnosing a production report from a local reproduction.

Runtime fingerprints make the input set visible. When a rule, content set, or season changes, the fingerprint changes with it; operators should not treat a changed fingerprint as an incidental cache detail.