When I saw this one I thought I was seeing things, I did
not think there was a game and watch by this name, so a
e-mail to Jules Burt who has a colomn in Retro classix,
it turns out that possibly Nintendo did not consider the
name Helmet suitable with the British sence of humour ,so it
was renamed Headache, and only released (under this name) in
the UK making it one rare game and watch.