Twizzle
It's very basic pinball but with marbles.
I've always loved marbles and although at this early age I didn't know what pinball was , I love pinball as well. So this game was perfect for me. Line up your marbles, use the centre 'Twizzle' slope to aim and get as many point ( or one of the three other games) to win. If you lose the marbles that come with it , they are easy enough to replace as well.
It's a game you can play against yourself and try and better your score with as well. So perfect for an only child. I love the whole design of this game, the cheerful yellow and blue coloured plastic and the fact it is fairly robust as well.