But there are a load of other options, and we’ll take a look at those now. The most popular slot bonus round is a free spins round.

These games are still around but are less popular in the cyber world. This could mean stopping a flashing light at the right time, or a moving light at the right stage of its journey.

These extra games came in all shapes and sizes, but back in the day when real players were hitting real buttons, they tended to like physical and skill challenges. As slot machines got more sophisticated they could introduce subsidiary rounds, often shown on a second screen above the main reels. Bonus rounds aren’t completely an operation of the online age though. However, these games would not have had a bonus round. But the games operated in much the same way at the base level: reels span round and you’d be awarded a prize for a set of matching symbols.

Back in the late 19 th century, they were big lumps of mechanical metal. Slots have come a long way since the first reels went spinning.