Bookworm was released for the Nintendo DS digital distribution service DSiWare on November 30, 2009.

[5] The game requires players to match adjacent letters to form a word in the English language.

In addition to standard letters, tiles of various colors can appear depending both on the current level within the game and on the length of words being formed.

They wrote, "PopCap's ultimate achievement is in taking simple elements that anyone can learn and turning them into raging, overwhelming obsessions.

"[6] Guinness World Records named Bookworm the most downloaded word puzzle game in June, 2010.