In Bookworm, players must build words from contiguous letter tiles on a grid. Longer and more difficult words score more points and produce a variety of "gem tiles" that offer additional bonuses (and mega-bonuses when multiple gem tiles are used in a single word). Burning tiles sear through normal tiles, reaching the bottom of the grid more quickly; they must be used before they reach the bottom or the game ends. With the new mobile version, players have the option to control the selection of letter tiles via d-pad/cursor, triple-tap or predictive text entry, such that the game controls are streamlined specifically for on-the-go play.