B2 Use of English Multiple Choice Exam 25

Sudoku

Are you a fan of the popular logical puzzle that goes by the name Sudoku? (1) you're not, the chances are you know somebody who is. Once (2) known outside Japan, this addictive brain teaser has become a common feature of newspaper puzzle pages all over the world.
Sudoku's great success (3) much to its simplicity. The game (4) for neither mathematical ability nor (5) knowledge and there are just a few sentences of straightforward instructions to read before you can play. The only skill required is the ability to (6) the difference between nine different symbols, and these don't even have to be numbers.
Some clever marketing has helped the game. Western newspapers worked (7) at promoting the game. Without this, it is unlikely that it would have (8) off and become quite such a runaway success.

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