Mega symbols in slots

What mega symbols in slots are

A mega symbol is a normal slot symbol drawn at a larger size so that it occupies a block of cells, such as 2×2 or 3×3. Each cell under it behaves as a copy of that symbol. If the giant symbol is a wild, every covered cell is a wild.

The term overlaps with colossal symbols, and studios use giant, jumbo, big and mega almost interchangeably. On this site we use ‘colossal’ for blocks that land across linked reels on traditional reel slots, and ‘mega’ for giant symbols that appear on grid games and often grow, shrink or move as a feature plays out. Both belong in our list of slot machine features.

Mega symbols are not Megaways: clearing up the names

Search for mega symbols in slots and you will find several unrelated mechanics that share the word. They work in completely different ways.

On Megaways slots, symbols are drawn taller when fewer of them land on a reel, but each still counts as one symbol, so they are not mega symbols. Megaclusters is a split mechanic, the opposite of a giant symbol. And a mega win is just a banner the game shows above a threshold.

How mega symbols work on a grid

On a cluster or grid slot, a mega symbol is placed by a feature after the random number generator has settled the spin. A typical sequence:

1. The RNG fills the grid and decides whether the feature that creates the giant symbol is triggered.
2. The game picks a position for the mega symbol and covers that block of cells.
3. Clusters or lines are counted, with each covered cell treated as one copy of the giant symbol.
4. Winning symbols are removed and new ones drop in, if the game uses cascades.
5. Depending on the rules, the giant symbol stays, shrinks to a smaller size or breaks into single symbols before the next cascade.
6. The sequence repeats until no new win forms, then the total is paid.

Step 5 is where mega symbols differ most from colossal blocks. A giant wild that breaks down into smaller wilds can feed several cascades in a row, which is how one feature can produce a chain of wins.

Worked example: a 3×3 giant wild on a cluster grid

Take an illustrative 7×7 cluster pays slot where five or more touching symbols win. A 3×3 giant wild lands in the middle, covering nine cells. Around its edge sit three red gems on one side and four blue gems on another.

Without the wild, neither group reaches five and the spin pays nothing. With it, the same nine cells join both clusters, because a wild can belong to more than one cluster at once in most cluster games. That double use is the main source of a giant wild’s value.

The Gargantoon: the best-known mega symbol

Play’n GO’s Reactoonz made the giant wild famous. Its Gargantoon is a 3×3 wild that appears on the 7×7 grid when the game’s charge meter fills, and it breaks down into smaller wilds in later cascades under the game’s rules. Our spec sheet lists Reactoonz at 96.51% RTP, high volatility, cluster pays of five or more and a 4,570× max win.

Reactoonz 2 continues the series on the same 7×7 grid with a 96.2% top RTP and a 5,083× max win. Gigantoonz, also from Play’n GO, takes the giant-symbol idea into its name on an 8×8 cluster grid, with a 96.25% top RTP and a 4,000× max win. Check each help screen for the sizes and rules its giant symbols use.

Mega symbols on payline and ways slots

On a reel slot, a 2×2 mega symbol on reels 1 and 2, rows 1 and 2, puts two matching symbols on each of those reels. On ways slots, that gives 2 × 2 = 4 ways before reel 3 is counted. On a 20-line game, every line passing through rows 1 or 2 on both reels starts with two matching symbols, while lines through row 3 miss it.

Larger blocks follow the same arithmetic. That is why giant symbols can turn an ordinary spin into a wide win, and why their landing frequency is carefully limited in the maths model.

Mega symbols, volatility and what play costs

Giant symbols, especially giant wilds, are expensive features in the maths budget. To keep the RTP on target, the developer makes them rare and trims ordinary wins. The effect is higher volatility: the cost of play is unchanged on average, but results swing more.

Mega win banners and the UK celebration rule

Because ‘mega’ also appears on win banners, it is worth knowing the rule behind them. Since 31 October 2021, online slots in Great Britain must not celebrate a return that is equal to or less than the stake, under the Commission’s responsible product design standard (opens in a new tab). A 40p return on a £1 spin, for example, cannot trigger celebratory sounds or graphics.

So a banner can only appear when you actually won more than you staked on that spin. It still says nothing about your session: a big-win banner after £50 of losing spins can leave you down overall. The balance and net position display shows the real figure; see our page on the net position rule.

Myths about giant and mega symbols

• Myth: a charge meter close to full means a giant wild is due. Fact: the next spin’s chance of adding charge is the same as always; the RNG has no memory.
• Myth: Megaways slots have mega symbols. Fact: Megaways changes how many symbols each reel shows; the tall symbols are still single symbols.
• Myth: mega symbols raise the RTP. Fact: the RTP is fixed before release; features only change how it is delivered.
• Myth: a slot that just produced a giant wild is ‘hot’. Fact: see our page on loose and tight slot machines.

Do fruit machines use mega symbols?

No. Pub and arcade fruit machines use fixed-size symbols, with features such as nudges and holds doing the work instead. Their prizes are also capped by category: a Category C pub machine allows a £1 maximum stake and a £100 top prize, and is 18+ only. Video-screen machines in casinos and betting shops can show modern features, but their stakes and prizes still follow their category.

UK rules for mega symbol slots

Giant-symbol slots follow the same UK rules as every other online slot: no autoplay, no turbo or slam-stop, a minimum 2.5 seconds per spin, a £5 stake limit for players aged 25+ and £2 for 18–24s, and no bonus buy on UK versions. The game’s rules and RTP must be published in the help screen, as required by the Commission’s standard on game rules and likelihood of winning (opens in a new tab). Our guide to slot rules in the UK brings them together.

Where to play mega symbol slots in the UK

No partner offer is linked to a giant-symbol game. For new customers aged 18+: Coral gives 100 free spins at 10p on selected games when you deposit and bet £10 on slots (spins valid 7 days); Ladbrokes gives 50 free spins a day for 10 days, up to 500 at 10p each, after you play £10 on slots; PlayOJO gives 80 free spins at 10p on Big Bass Bonanza with a £10 first deposit, with winnings paid in cash. Terms apply, including excluded payment methods.

To find Reactoonz or Gigantoonz, search the casino’s lobby; game availability changes. Our casino pages cover each partner’s licence and payments. If play stops feeling like entertainment, GamCare (opens in a new tab) runs the free National Gambling Helpline on 0808 8020 133.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: plan a slot budget. Free, confidential help: National Gambling Helpline 0808 8020 133.