A pokie can pass thousands of test spins and still have a problem buried in its bonus features. So how do developers find those faults before the game reaches players?
A new pokie might be perfectly playable and still be months away from release. Getting the game to work is one thing; proving that it works correctly is another. A developer needs to know what happens when an unusual combination comes up, whether the payouts match the game’s mathematics, and what happens when the software encounters a problem. There’s a fair amount of work involved, especially when you’re dealing with a game that can produce millions of different outcomes.
Before a new title reaches players, its developer has to put it through a series of tests. The process starts with the mathematics behind each spin and continues through the game’s features, software performance and final release checks.
The Mathematics Have to Work Before the Reels Do
Every pokie begins with a mathematical model that determines which outcomes are possible and what each winning combination pays. The random number generator (RNG) supplies the numbers used to select outcomes, while the game’s rules determine what those outcomes are worth.
You can see the results in VegaStars’ collection of online pokies, which includes titles from Pragmatic Play and Hacksaw Gaming. Each game arrives with its own mathematical design, so developers have to verify the calculations before the finished software reaches the casino.
Mike Burger, Director of Engineering at Gaming Laboratories International (GLI), explained the testing process in June 2025: “GLI typically creates an independent simulation based on the game’s source code, mathematical documentation, and game rules, running billions of simulated games.”
Burger’s description concerns electronic gaming machines, but the mathematical principles also apply to online pokies. The simulation checks whether the software produces the outcomes specified in the game’s design.
Three checks are particularly important:
| Test | What It Checks |
| RNG testing | Whether random numbers are generated and used correctly |
| Return to Player (RTP) | Whether simulated results match the game’s theoretical return |
| Payout verification | Whether winning combinations receive the correct amounts |
A game with a theoretical RTP of 96% is designed to return $96 for every $100 wagered across a sufficiently large number of spins. That figure describes a long-run mathematical average, not what an individual player will receive during a session.
Bonus Features Get Their Own Stress Tests
Ordinary gameplay is a poor way to test an event that occurs once in hundreds of thousands of spins. Developers need to examine those outcomes without waiting for them to happen naturally, so testing software allows them to trigger specific combinations.
Take Gates of Olympus 1000, one of the Pragmatic Play titles in the VegaStars pokies catalogue. Its multiplier mechanics give developers several things to check, including whether a multiplier activates under the correct conditions and whether the resulting win is calculated accurately.
The same principle applies to free spins and other bonus rounds. Each feature has rules governing when it starts, what happens during play and when it finishes. Testing has to cover the unusual situations as well as the expected ones.
Engineers can deliberately reproduce situations such as:
- A multiplier activating during a winning spin, with the final amount checked against the mathematical specification.
- A free-spin round reaching its final spin, with the game returning correctly to ordinary play.
- A maximum permitted winning combination occurring, with the payout staying within the game’s programmed limits.
These tests also help developers find problems that ordinary playtesting would take an impractical amount of time to uncover. Once a defect is corrected, the same situation can be reproduced to confirm that the fix works.
The Bugs That Have Nothing to Do With Luck
A game can pass its mathematical tests and still be frustrating to play. A bonus animation might cover the balance display, or a touchscreen control might stop responding on a particular phone. Those are software problems, and they need a different kind of testing.
Quality assurance, usually called QA, involves checking whether software behaves as intended under different conditions. The basic principles include the use of manual checks and automated tests to identify defects.
For online pokies, mobile compatibility deserves particular attention. A game designed on a large monitor still has to display its controls correctly on a smaller screen, and players need to be able to read the information without accidentally touching something else.
VegaStars provides access to its casino through web browsers and mobile applications, giving players different ways to reach its pokies collection. The games themselves need to operate correctly in the environments for which they’re released.
A Finished Game Still Has to Pass Its Final Checks
Passing individual tests gets a game closer to release, but the complete software package needs another round of checks. Developers must confirm that the approved version contains the correct settings and that earlier fixes haven’t introduced new problems.
This is where integration testing becomes important. A game might calculate a bonus correctly in its development environment, yet encounter a problem when communicating with the system that records the player’s balance.
The final checks examine whether the game and its hosting environment exchange information correctly. They also establish whether the released software matches the version that was tested.
The VegaStars catalogue includes games from approved providers. Each provider title must work correctly, not just when things go right, but also when things go wrong, such as a lost connection. The game needs to retain the correct state so that the player can return without losing an outcome or receiving an incorrect balance.
Testing Doesn’t Stop When the Game Goes Live
Software changes after release. Developers correct bugs, update compatibility and sometimes modify parts of a game’s underlying code. Those changes need checking because a fix in one area can introduce a problem elsewhere.
Independent testing laboratory iTech Labs describes ongoing compliance monitoring as a process that examines software changes and checks whether games continue to meet their tested requirements.
One important part is change-impact testing. Engineers identify what has been altered and determine which parts of the software need another examination.
Version control is equally important. A game approved in one configuration must be identifiable, so testers can establish whether the software running after an update matches the version that was checked.
A minor visual correction won’t necessarily require the same work as a change to the game’s mathematics. The testing depends on what the developer has changed and which functions are affected.
The Best Testing Is the Testing Players Never Notice
Once a pokie has been released, players have little reason to think about its development history. They choose a game, place a wager and expect the result to appear correctly.
That straightforward experience takes a substantial amount of work to deliver. The mathematics must produce the intended outcomes, the bonus features must follow their rules, and the software must handle ordinary gameplay without errors.
For someone browsing the Australian pokies collection at VegaStars, all titles are finished games, ready to play. The development process behind them is largely invisible, and that’s the point of all the testing. Players shouldn’t have to wonder whether a bonus has been calculated correctly or whether an interrupted spin has affected their balance. Those questions belong in the testing department, long before the game reaches the casino.
Online pokies are intended for adults aged 18 and over and should be treated as entertainment. Set a spending limit before playing, and never gamble with money needed for everyday expenses.
