New game mechanics in online casino games

Online slots have changed shape over the past decade. Reels change height from one spin to the next, symbols pay wherever they land, winning combinations clear and refill, and a buy button sells entry to the bonus round. Two of the studios behind those designs became takeover targets: Evolution, the Stockholm-listed casino games supplier, agreed in 2021 to pay up to €450 million for Big Time Gaming, which created Megaways, and in 2022 up to €340 million for Nolimit City.

The changes run deeper than the look of a spin. They set how fast a session moves, how much one decision can cost and how a small return appears on screen, and in Canada each of those has drawn a response. Researchers at the University of Waterloo measured how players read small returns, Ontario wrote limits on speed and win celebrations into its rulebook, and welcome-bonus terms treat some mechanics differently from others.

Megaways made the grid itself random

A conventional video slot keeps a fixed grid, so it offers the same number of paylines or ways on every spin. Big Time Gaming broke that pattern when it launched Megaways in 2016. In its design, the number of symbols on each of six reels changes from spin to spin, and those counts multiply across the reels into the ways to win, up to 117,649 when all six show seven symbols. At launch, the studio said slots online and on casino floors had so far stopped at 4,096 ways.

The format spread through licensing. By April 2021, when Evolution agreed to buy the studio, Megaways ran in more than 200 games from multiple providers. Big Time Gaming still sells licences today, and its program now covers two related formats, Megaclusters and Megapays, alongside the original.

Nolimit City reached a variable grid by another route. The studio, which created the xWays and xNudge mechanics, uses an xWays symbol that reveals a stack of matching symbols when it lands, and the more it reveals, the more ways that spin has to win. An xNudge wild can nudge up or down to fill its reel, and its multiplier rises by one with every nudge.

Tumbles and multipliers stretch one spin into a sequence

Pragmatic Play’s Gates of Olympus and Sweet Bonanza games do without paylines. In Gates of Olympus 1000, a 6×5 grid pays for eight or more matching symbols anywhere on the screen, and a tumble feature removes each winning combination and drops new symbols in from the top. One paid spin can therefore produce a chain of wins before the tumble sequence ends.

Multipliers make the length of that chain matter. In the same game, multiplier symbols take random values from 2x to 1,000x, and the values are combined at the end of a tumble sequence and applied to the win. Sugar Rush, another Pragmatic title, marks the grid spots where a winning cluster landed, and each later hit on a marked spot during the same spin adds a multiplier there, starting at 2x and doubling up to 128x.

In Sweet Bonanza, the scatters that open the bonus round pay a prize of their own: four to six of them award up to 100x the bet along with 10 free spins. A 2025 twist raised the ceiling on that trigger prize.

Pragmatic launched Gates of Olympus Super Scatter in April 2025 with a separate symbol that pays when it lands on the triggering spin: one Super Scatter wins 100x the bet, two win 500x, three win 5,000x and four award the game’s 50,000x maximum. In July 2025 the studio released the third game in the series, Sweet Bonanza Super Scatter.

The bonus round now has a price

In a traditional slot, the bonus round arrives when it arrives. Nolimit City’s Mental, released in August 2021, lists its free-spins frequency as 1 in 216. A feature buy skips the wait: the player pays a fixed multiple of the stake and goes straight into the round. Gates of Olympus 1000 charges 100x the bet for its buy, and Mental’s buy-ins range from 80x to 1,000x the base bet, so its cheapest purchase at the €0.20 minimum stake costs €16.

That price changes the size of a single decision, and not every market allows the purchase. Mental’s page warns that its buy feature may be removed in some regulated markets. Pragmatic offered two bonus buy options on Gates of Olympus Super Scatter only in select markets, one of them a Super Free Spins round in which multipliers start at 10x.

Nolimit City also builds smaller and larger versions of the same purchase. Its xTra Spin, in Tombstone Begins, offers the chance to buy one more spin after the bonus round, keeping all the multipliers from the previous spin. Its xGod feature, in Supersized, goes the other way: a purchasable bonus round that the studio says can deliver the game’s maximum win on its own.

Bonus terms don’t treat every mechanic alike

Welcome bonuses meet these mechanics in the fine print. The bonus policy on one casino’s Canada-facing site caps each bet at C$10 while a bonus is active and counts buying features toward that cap, so an 80x buy-in fits only at a base stake of 12.5 cents or less, and a 1,000x one needs a stake of one cent. The same policy keeps crash-style and mine-style games off bonus funds, and it can void a bonus round’s winnings if bonus money only went toward a game’s saved progress.

Games also count toward the wagering requirement at different rates. That policy counts most slots in full, a list of named titles at 50 per cent and most non-live table games at 10 per cent, while another casino’s terms count video slots in full, other games at 5 per cent and live casino at zero. PlayNow’s casino match for first-time depositors in British Columbia shuts out four game types: its token can’t be used on roulette, baccarat, sic bo or live casino games.

A weighting only matters next to the multiple it scales: a 35x requirement on the bonus, cleared at 10 per cent, means wagers of 350 times the bonus. Those multiples differ by operator and change whenever an offer does, more than an article on game design can track. Readers outside Ontario can turn to BonusFinder Canada’s ranking of the best casino welcome bonuses in Canada that it can list for their province, and many listings give the playthrough multiple and the minimum deposit in a Bonus Details panel.

Waterloo measured what a partial win feels like

Terms decide where bonus money can go, but game design decides what a spin tells the player. In 2010, Mike Dixon and colleagues at the University of Waterloo reported in the journal Addiction on 40 novices playing a multi-line slot. Spins that returned less than the wager, yet still set off the machine’s winning sights and sounds, produced skin conductance responses about as large as real wins did, and larger than plain losses. The team called them losses disguised as wins.

Memory bends as well. In a study the university described in 2013, 96 gamblers played simulators that dealt 28 wins and 28 disguised losses, then overestimated how often they had won more than they wagered, and those who played with the sound on misremembered winning more often.

A 2017 Waterloo study found that on games full of such outcomes, players won on about 10 per cent of spins. Those shown an unrelated video beforehand believed they had won on 23 per cent, while players who first watched a short video explaining these outcomes recalled 12 per cent.

The 2013 write-up noted that modern machines featured hundreds of lines and averaged more than 400 sounds, and Dixon suggested that some players rely on those sounds to tell whether they have won. Ontario has since tied the celebration to the stake: its standard 2.20 bars win sounds and visuals on any slot return less than or equal to the total wagered. Nolimit City’s xRIP, in Tombstone RIP, draws a similar line in the payout itself: the studio says a spin pays nothing when its total win is less than the base stake.

Ontario sets the pace of play

The province’s rules go beyond what a spin shows. Under the internet gaming standards set by Ontario’s regulator, the AGCO, regulated sites can’t offer autoplay on slots, each game cycle has to be started separately, and the sites can’t offer any way to play two slots at the same time, whether split screen, multi-screen or another layout.

The standards also set a speed limit. At least 2.5 seconds must pass between the start of one game cycle and the next, and because a player may not shorten the time to a result, turbo, quick spin and slam stop features are banned. That ban has one carve-out: bonus or feature games played without an additional stake.

Slot sessions also have to show the running score. The screen must display the player’s net position in Canadian dollars, meaning all winnings minus all losses since the session began, and players need a way to track the passage of time.

The rules bind the studios as well as the sites. On August 20, 2026, the AGCO ordered C$70,000 in penalties against Booming Games (Malta) Limited after autoplay had been available to players in the province on multiple slot games for several months.

The AGCO’s own compliance checks caught the problem, and autoplay on the affected games was disabled. As a registered supplier, Booming was responsible for keeping its games compliant before launch and throughout their life, and the regulator used the case to describe the province as having “some of the toughest game-design standards in North America”.

A net-position counter shows where a session stands, but it doesn’t say when to stop. ConnexOntario, the province’s round-the-clock line for gambling help, is 1-866-531-2600, and BetGuard, the portal iGaming Ontario launched in 2026, lets people 19 or over block their own access across Ontario’s regulated sites in one go, OLG’s too, for a fixed or custom term. In B.C., the Gambling Support BC Line’s number is 1-888-795-6111, answered 24 hours a day, and PlayNow players there can exclude themselves through Game Break, the self-exclusion program BCLC runs.