In Who Knows What, each player receives a sheet with different categories on it. The game starts as soon as a letter has been selected from the letter bar. Then the first row is played and you have to fill in each category as quickly as possible with a word that starts with the chosen letter. This continues until all rows are filled. The points are then added together. The player with the most points wins Who Knows What. This is the junior edition of Who Knows What.