The US has criticised a decision by Google Executive Chairman Eric Schmidt and former diplomat Bill Richardson to visit North Korea.
State Department spokeswoman Victoria Nuland said: "Frankly, we don't think the timing of this is particularly helpful," citing North Korea's launch of a long-range rocket in December.
She said Schmidt and Richardson would be travelling as private citizens, not representatives of the US Government.
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The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.