Does anyone know the name of this short story for children which I read in the 70s / early 80s?
It is set in a seaside arcade where an old lady, who minds it, has fallen asleep and a spider is making a web on her. The whole place looks a bit rubbish. These two boys go in and find a game that looks kind of clean, and weird enough that they have a go on it.
The story has a name that is also the name of the game... It's something the somethings... I can't remember it. The boys themselves say "whoseing the whatsits?" when they read its name.
As they play, the graphics get more and more realistic until an angry alien climbs out of his now punctured enemy ship complaining at them, something is triggered and the entire arcade parlour gets destroyed and the kids barely make it out.
At the end the boys realise the game is some kind of test to make people around the galaxy participate unknowingly in some space battle.