Daily archive
Every past deal is still playable. Nothing here expires — each puzzle is generated from its own date, so it can always be rebuilt exactly as it was.
Playing an old deal
An archived deal counts toward your completions, mastery tiers and records, exactly like playing it on the day. What it cannot do is rebuild a streak from further back than yesterday — only the previous day can repair one.
That limit is deliberate. A streak is meant to record turning up regularly, and a streak you could reconstruct months later would not mean anything.