Japanese games manufacturer Nintendo has seen its nine-month profit plunge by 30%, prompting its boss to cut his pay in half. The slump was blamed on poor sales of the Wii U console as gamers flock to the Microsoft Xbox One and Sony PS4. Company president Satoru Itwata said he would slash his salary for five months to atone for the firm's woes. He also said all directors would cut their pay by an average of 25% in the same period.