Key takeaways
- Common on fruit machines.
- A number from 1 to 12 is shown.
- Middle numbers are the worst to gamble.
- You can always collect.
In shortIn a hi-lo gamble a number is shown and you guess whether the next will be higher or lower. Gamble on low and high numbers; collect on the middle ones.
How it works
Win a prize, and the machine offers to gamble it. A reel shows a number, usually 1 to 12. Guess right and you climb the cash ladder; guess wrong and you lose the prize.
The odds
| Showing | Best guess | Chance |
|---|---|---|
| 1 or 12 | Higher or lower | About 92% |
| 2 or 11 | Higher or lower | About 83% |
| 4 or 9 | Higher or lower | About 67% |
| 6 or 7 | Either | About 50% |
Assuming each number is equally likely and a repeat loses; machines vary.
When to collect
On a six or seven the gamble is close to a coin toss for the whole prize. Collecting there is the sensible habit.
Online
Card-colour gambles on online slots are the same idea: a fair double-or-nothing with no house edge and a lot of extra swing.
Elsewhere on the site: Fruit machines, Gates of Olympus slot machine, Book of Dead vs Gates of Olympus and Ways-to-win slot machines.
Keep reading: Are slot machines rigged?, Casino slot machines, Book of Dead slot machine and Nudges.
Next: how slot machines work, or seven slots taken apart.
Slot figures are developers' published defaults, each confirmed against two sources; the version at your casino can differ. UK land-based stake and prize limits and online rule dates were checked against Gambling Commission and licensing authority sources on 6 October 2026. History follows commonly cited accounts. Offer terms dated 5 October 2026. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
What is a hi-lo gamble?
A higher-or-lower guess to increase a prize.
When should I gamble?
On very low or very high numbers.
Is it fair?
Machines vary; treat it as roughly even at the middle.
Must I gamble?
No.