Bookworm uses the same formula of most word games, offering a field of random tiles from A to Z, (with 'Qu' combined in to one tile) that players must search through to find words. The tiles are large enough that accurately tapping them with your finger isn't an issue and you can then either select the rest of your word by tapping adjacent tiles or dragging your finger through them. Lex, the Bookworm mascot accompanies you throughout the game, showing you the score of the current word you have selected. Tapping the selected word removes the tiles from the board. Lex eats them, and sometimes offers a definition of the previous word as more tiles fall from the top.