There are four suits: circles, squares, crosses and triangles. You can change suit by laying the same number as has been laid in the suit you lay down yourself. Also, the card numbered 20 can be used to change from a suit to any other suit at any time.
When the first person has finished, the others count up how many penalty points they have on the cards they have left in their hand.
‘Whot! was invented (but, apparently, not patented) and trademarked by William Henry Storey, of Southend-on-Sea, England in 1935. It was first marketed by the company Storey & Co of Croydon, which he set up in 1930, but was soon acquired by Waddingtons of Leeds, and was popular in Britain in the 1950's and 1960's.’