Words Collide: A tile-swapping game with a range of modes including single-player, cooperative multiplayer, daily mode and adventure. Earn coins to unlock upgrades such as extra letters, hints and combos.

Price: Free with in-app purchases

Scrabble: Most addictive and engrossing if you can ignore the ad breaks, gifts and designer tiles paraphernalia. Choose from your contact list, Facebook friends, strangers or bots. There’s also a Match of The Day feature if you’re looking for some real challenge.