Birthday (German: Der Geburtstag) is a simple, German patience game, which is played with a French pack of 52 cards.
[1] Starting layout and subsequent stages
Before shuffling, four cards are removed from the pack to form four foundations with a four-figure number that acts as a target.
These cards form the start layout or foundation.
If, after four passes, all the cards have been placed, the patience has been solved.