Discworld is a flat world ten thousand miles across that rests on the backs of four elephants who stand on the shell of Great A'Tuin, the sky turtle, as he, or, as it might be, she, swims through space. From Ankh-Morpork, jewel (okay, so it's a carbuncle) of cities, venture hubwards across the brassica'ed Sto Plains to the Ramtops, cross the Circle Sea to the dark and mysterious continent of Klatch.

Discworld combines the humour and richness of Terry's books with a high-quality mud that appeals to both fans and those who have never read his work. As a very kind reviewer said: 'With fish, wombles, intelligent shades of blue, straw dummies, shiny plaques, mended drums, Shifty Jim, Ankh-Morpork pence all on a very chilly spindlewinter's afternoon, Discworld had me laughing at every second turn, and left me wanting to read more.

'The feeling I got from the mud was one of fun, quirkiness, and constant surprises. I spent a whole lot more time on there than I expected, but it was time well spent!'