sentences:  Inevitably each setter has an individual (and often very recognisable) approach to clue-writing, but the way in which wordplay devices are used and indicated is kept within a defined set of rules.In the "Guardian", "Independent", "Financial Times" and "Telegraph" Toughie series the setters' pseudonyms are published, so solvers become familiar with the styles of individual setters rather than house rules.Thus the level of difficulty is associated with the setter rather than the newspaper, though puzzles by individual setters can actually vary in difficulty considerably.