As the range of themes adopted by the manufacturers became ever wider, the fundamental mechanics of these old machines remained much the same for generations. While most of them had three reels, designs were evolved which meant that some slot game machines had four, five as well as six reels in play. Images of these became synonymous with UK casinos.

There is no doubt that their popularity was due in no small measure to the hypnotic effect of the spinning wheels - and this is the reason why this formula is still one of the most popular forms of gambling today, among both punters and also the machine companies. Lots of people mourn the passing of the old one-armed bandits, and their enduring popularity is shown in the proven fact that many old machines can fetch large sums on auction sites, and they are increasingly sought-after as collector's pieces.

The fact that the machines also involved some physical effort on the involved in the player also added to their appeal.