Terry Pratchett and the Discworld novels

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terry pratcherr, man with a hat, is one of my best fantasy authors(above tolkien, discworld is funny). he has written a very successffull discworld book series, about which we shall talk here. discworld is(as its name tells us) a flat world, that is carried through space at the back of four elephants, that are standing on the the only turtle ever to feature on the Hertzsprung-Russell diagram. the sex of elephants is still unknown. till now i have read about four books of the discworld series, and a long time ago his books for children(wings, diggers...), yet still favourite to me is the color of magic, first of the discworld series(hrun, the smartest barbarian, he doesnt move his lips while thinking:D).so tell here what you think of discworld, which books are your favourite, least favourite(althou i know there is no such thing as that) and owerall score of the whole series.