In the 1930s, when Alfred Butts invented his word game which was eventually called Scrabble, he based the game on two then-popular games: crossword puzzles and Anagrams. Anagrams was popular in the early 20th century but was also popular earlier. Many mass produced examples demonstrate that various versions of Anagrams entertained children and adults in the later 19th century. The rules are simple and offer endless variations. Printed letters on cards, cardboard squares, or wooden cubes are handed out. Players compete making words from their letters. The game promotes spelling skills and vocabulary; it is entertaining as well. this version is titled "Letters," likely to avoid copyright infringement. Anagrams is still popular today.