Actually, Fruit machine is a term used in Great Britain to describe slots, but besides, it has some special features compared to regular US slots.
As a rule, the fruit machines have some bonus features. Let's take for example games you can play at InterCasino. These online slot games has the following features:
- Nudge and hold features
- Prize Ladder
- Gamble game (type Hi/Lo)
During a play you can get up to 4 'nudges' - to move symbol on the line one position down. Holds give you a chance to hold in place the symbols on the reel. Any win will be shown on the Prize Ladder. Any prize that is available on the Prize Ladder activates Hi/Lo Gamble game.
In addition to the listed features some games offer the bonus rounds played on the second screen.
There are similar fruit machines in Microgaming software. It's AWP slot game.

Diamond Wins: Hold&Win
- Soft: Playson
- Reels / Lines: 5 Reel / 10 Line
- Type:
- MinBet / MaxBet : $0 - $0

Fruits Gone Wild Supreme
- Soft: StakeLogic
- Reels / Lines: 6 Reel / 40 Line
- Type: Free Spins, Multipliers, Super Stake
- MinBet / MaxBet : $0 - $0

Super Marble
- Soft: Booongo
- Reels / Lines: 5 Reel / 25 Line
- Type: Multipliers
- MinBet / MaxBet : $0 - $0

Runner Runner Megaways
- Soft: StakeLogic
- Reels / Lines: 6 Reel / 117649 Lines, 64 Line
- Type: 117649 Ways, Megaways, Free Spins, Multipliers, Super Stake
- MinBet / MaxBet : $0 - $0

Fruit Rainbow
- Soft: Pragmatic Play
- Reels / Lines: 5 Reel / 40 Line
- Type:
- MinBet / MaxBet : $0 - $0