Spelltower

At its most frenetic, this game has you drag snake-like paths through a grid of letter tiles in what amounts to a high-octane mash-up of a wordsearch and Tetris. The daily mode is rather more sedate, letting you relax while tackling a single tower of tiles that disappear when words are submitted. But that does mean you must think ahead to make best use of your letters and not leave any stranded. £free (IAP) / Android, IOS