Tokyo shares closed lower Friday as worries over a flagged stimulus dented spirits, but Nintendo rose again as the hugely popular Pokemon Go app launched in Japan, its home market.

Trading got off to a weak start as investors bought the yen after an interview was aired in which central bank chief Haruhiko Kuroda ruled out using so-called helicopter money in any fresh economy-boosting measures.

The strategy involves funnelling cash directly into the economy to boost growth, including possibly putting cash straight into people’s bank accounts, rather than the more traditional bond-buying method.