Willi Wacker, apparently, is the German name for comic-strip character Andy Capp, who provides the theme for this game. Players seek to play same-number or sequential-number sets of cards from their hands to the table (the cards are numbered 1-8). Picture cards add wrinkles such as allowing players to steal cards from the hands or played sets of opponents. Card sets and the points they bring are safe only when the correct picture card - Andy/Willi finally getting a beer - is played.
Andy Capp is a British comic strip created by cartoonist Reg Smythe (1917–1998), seen in The Daily Mirror and The Sunday Mirror newspapers since 5 August 1957. Originally a single-panel cartoon, it was later expanded to four panels.