How the daily boards work
A new set of boards arrives at midnight, your local time. Each one is built from the date, so two people on two different phones play exactly the same wall, the same waves or the same crate order.
The daily always uses the standard mode at Normal difficulty: classic walls from the first stage in Seawall Breaker, the classic watch from the first wave in Harbour Watch and a marathon shift in Dockside Crates. That keeps the results comparable from day to day.
Finishing at least one daily game on consecutive days builds your streak. Skip a day and the count drops back to one; your longest run is kept in your records.