iPhone, PopCap, £2.99

Word games might lack the high-octane thrills of the Streetfighter titles and the Halo universe, but they can be every bit as addictive. Bookworm certainly is, with its combination of simple concept and horribly compelling gameplay. Create words from randomly selected tiles and get ready for a mental workout that will test both your vocabulary and your grey matter. While it’s not perfect – it has only two modes and often boxes players into lexiconical corners – at £2.99 it’s a great-value distraction.