The game involves 9 small skittles arranged in a 3 x 3 square, usually within a shallow open-topped wooden box sitting on a table-top. The wooden ball (about the size of a golf ball) hangs from a string or chain attached to the top of a vertical wooden post rising from one corner of the box. The aim of the game is to knock down the skittles by swinging the ball in an arc round the post (rather than aiming directly at the skittles).
It is also the name of a game in which each player spins a spinning top with a string, to knock down skittles, earning points for doing so. This game is quite a large table game, around 1M x 1.5M The game may be referred to as "De'il Among the Tailors" in Scotland. An example of this game is on display in Osterley Manor in London.
The game can be seen in a pub setting in the Beatles movie 'A Hard Day's Night' at the 1 hour 4 minute mark. Ringo goes AWOL from a gig and ends up annoying people playing various pub games.
In the picturesque name, the 'devil' refers to the ball and the 'tailors' are the kittles.