Last updated: 6 September 2026
01 / U88 GUIDE
What does a bonus buy actually purchase, and what does it cost per stake?
Free spins rounds are where most modern slots keep the interesting part of their paytable. Reaching one requires landing the scatter combination, which on a high-variance title can take hundreds of spins and a good deal of patience. The bonus buy button removes the wait: click it, pay the stated price, and the feature starts on the next screen.
What you are purchasing is entry, not outcome. The round that follows is the same round you would have received had the scatters landed naturally, with the same symbol weightings and the same range of results. Plenty of bought features return less than they cost. That is not a fault; it is the ordinary distribution doing what it does.
The price is displayed as a multiple of your current stake, which is why it scales. At RM0.20 a spin a 100× buy costs RM20. At RM2 a spin the same button costs RM200. The multiple stays put; the ringgit figure does not, and interfaces do not always make that as obvious as they might.
02 / U88 GUIDE
Buy prices are calibrated to what the feature is expected to return
Studios do not pick the multiple by feel. The maths team calculates the average return of the free spins round across a very large sample, then prices the buy slightly above it so the operator retains a margin. A feature that averages a return of around 95 times the stake gets priced near 100×. A richer feature costs more.
This is why buy prices vary so much between titles, and why a cheap-looking buy is usually cheap for a reason. A 40× buy is not a discount on a 200× feature. It is a 40× buy on a feature worth roughly 40×.
The calibration also explains why buy prices move when a studio adjusts a game. Rebalance the free spins symbol weightings and the feature average return shifts, so the buy multiple has to shift with it or the pricing stops making sense. Players occasionally notice the same title carrying a different multiple in two lobbies; that is normally a different configuration of the game rather than an operator marking it up on a whim.
Two practical consequences follow:
- Comparing buy prices across games tells you very little. A higher price signals a richer feature, not a worse deal.
- There is no arbitrage. The buy is priced from the same simulation that produced the published return figure. Nobody left value on the table for you to collect.
The relationship between feature weighting and base-game thinness is worked through on slot volatility. The short version: games with expensive buys are usually games whose base play is deliberately quiet.
03 / U88 GUIDE
Buy-mode RTP is often published separately, and for a real reason
Removing the base game changes the arithmetic. A slot's headline return figure is calculated across normal play, which includes hundreds of base spins contributing their own small returns before a feature ever triggers. Buy mode deletes all of that and leaves only the feature.
Because those are two different games mathematically, many studios publish two figures, one for standard play and one for buy mode. Sometimes they are close. Sometimes buy mode is a little lower, sometimes marginally higher. What matters is that they are calculated separately and should be read separately.
| Standard play | Bonus buy | |
|---|---|---|
| Cost per action | One stake per spin | Typically 50× to 200× stake |
| What you get | Base spins plus eventual feature | Feature only, immediately |
| Spend rate | Slow, controlled by spin speed | Very fast, controlled by click speed |
| Return figure | Headline published RTP | Often a separate published figure |
| Variance experienced | Smoothed by base-game wins | Extreme, feature outcome only |
| Availability | Universal | Restricted or banned in several markets |
Where a game shows both numbers, read the one that applies to how you intend to play. Quoting the standard figure while only ever pressing buy is a slightly comforting mistake. More on where these percentages come from is on RTP explained.
04 / U88 GUIDE
Several regulated markets restrict feature buys on harm-reduction grounds
The mechanic is not universally available. The United Kingdom prohibits it outright for licensed operators. Several European regulators have taken similar positions, and others require operators to disable it for specific customer groups. The reasoning across regulators is consistent: a button that converts a slow game into a fast one, at a hundred times the unit cost, compresses losses into a much shorter window and removes the natural pacing that base-game spins provide.
Availability therefore depends on the jurisdiction a game is served into, and on the studio. Some providers ship dual builds, one with the button and one without. If you find a title where the buy option is missing, that is usually a licensing decision rather than a bug.
Regardless of where you play, the underlying point holds. The restriction exists because of the spend rate, not because the button is rigged.
05 / U88 GUIDE
Buying accelerates spend without improving a single thing about the odds
This is the part worth being blunt about. A bonus buy does not raise your expected return. It does not make the feature more generous, does not seed better symbols, and does not put you in some favourable mode. Every spin and every feature outcome is generated independently, exactly as described in how slots work.
What it changes is speed. A player spinning RM1 a click through a base game might stake RM600 in an hour. The same player pressing a 100× buy every fifteen seconds is staking RM100 per click. The house edge is a percentage of turnover, so multiplying turnover multiplies expected loss in exact proportion. Nothing about the fairness of the game changed. Only the volume did.
The compression is worth picturing properly. Three hundred base spins at RM1 is an hour of play and RM300 of turnover. Three buys at 100× on the same RM1 stake is RM300 of turnover in under a minute. Identical exposure, wildly different clock, and far less time in which a player might notice the balance moving and decide to stop.
There is one genuine, non-financial use case: buys let a player see a feature they would otherwise never reach, which for someone curious about a game's design is worth something as entertainment. That is a legitimate reason. Believing the button is a shortcut to profit is not, and it is the belief that empties accounts fastest.
06 / U88 GUIDE
If you use the button, use it with a hard number attached
Decide before you open the game how many buys the session includes. Two, three, whatever the budget supports at the stake you are actually using. Then stop at that number regardless of what the last one paid, because a bought feature that returned nothing is not owed a follow-up and one that paid well is not on a run.
Check the buy price in ringgit rather than as a multiple, since the multiple hides how quickly the figure grows with stake size. Check whether a separate buy-mode return figure is published. And be honest about whether you are buying entertainment or chasing losses, because the mechanic is unusually good at disguising the second as the first. Browse the wider slot games catalogue if you would rather pace a session across the base game. Play only if you are 18 or over, and set the budget before you open the lobby.
KEY TAKEAWAYS
What to remember
- Bonus buy, also called feature buy, is a button that purchases immediate entry to the free spins round for a set multiple of stake.
- Typical buy prices sit between roughly 50× and 200× stake, depending on how much return the studio has loaded into the feature.
- The price is calibrated to the feature expected value, so buying is neither a bargain nor a trap. It is priced fairly and still negative.
- Many studios publish a separate return figure for buy mode, because removing the base game changes the calculation.
- Several regulated markets restrict or ban feature buys entirely on harm-reduction grounds, so availability varies by jurisdiction.
- The honest warning: buying features multiplies spend per minute without improving the underlying edge at all.