Slot types

A slot is a stake, a random draw, and a paytable. The marketing name on the cabinet does not change that. The useful differences are the reel layout, how a win is counted, and whether part of the stake is funding a jackpot. This page is the map. It does not claim that every type below is in every lobby we reviewed.

Classic reels

A classic slot is usually three reels and a handful of paylines, often one, three or five. Symbols are fruit, bars, sevens and a wild. The paytable is short enough to read in a minute. Stake sizes are often smaller. The trade-off is a narrow set of outcomes: you either hit a line or you do not. There is rarely a long feature to change the rhythm of the session.

Video slots and paylines

A video slot is commonly five reels and three or four rows, with a fixed set of paylines. A line is a pattern the game checks after the spin. Twenty lines does not mean twenty wins. It means twenty patterns are inspected, and the stake is often the line stake multiplied by the number of lines. Read whether the game lets you turn lines off. If it does, turning them off usually cuts both the stake and the ways you can be paid.

Features sit on top of the lines: wilds that substitute, scatters that pay anywhere, and free-spin rounds that use the same reels with a different rule. The feature is part of the game’s return. It is not a gift added after the return was calculated. RTP and volatility explain that split.

Ways games

A ways game drops paylines. Matching symbols on adjacent reels, starting from the left, pay if they land on any row of those reels. A 5-reel game with 3 rows is 243 ways. Four rows is 1,024 ways. The number is a count of patterns, not a count of prizes. A ways game can still be high volatility if the large prizes sit in a feature that rarely triggers.

Changing reel heights

Some games change the number of symbols on each reel from spin to spin, which changes the number of ways. The mechanic is widely sold under a licensed name. None of the four reviews on this site claims that mechanic is in that casino’s lobby. If a game uses it, the help screen will say how many symbols can appear and how the ways are counted. Read that screen. The cabinet art will not tell you.

Cluster and hold-and-win

A cluster game pays for a group of touching symbols rather than a line. Wins are often removed and the reels drop new symbols into the gaps. That is a cascade. The return of the game includes the cascades. A single paid spin can contain several drops, which makes the result feel busier without changing the stake.

Hold-and-win, sometimes shown as a respin feature, locks some symbols and respin the rest for a fixed number of spins. Landing another special symbol usually resets the counter. The feature ends when the counter runs out or the grid is full. These games often carry a fixed prize or a jackpot on the full grid. The prize is in the paytable. It is not an extra decided after you have started.

Jackpot slots

A jackpot slot adds a prize pool, or a fixed top prize, on top of the ordinary paytable. Part of each stake may fund the pool. That contribution is why two games with similar art can publish different base-game returns. The types of pool, and why we do not print live pot sizes, are on the jackpot slots page.

What to read before the first paid spin

• The stake the spin button will actually take, including lines or ways.
• Whether wilds substitute for the symbols that pay the most.
• How the feature is triggered, and whether the feature can be bought. A buy changes the stake for that spin.
• The published return, if the help file shows one, and the jurisdiction it applies to. Operators can ship more than one maths model.
• Any symbol or game excluded from the bonus you claimed. Silversands publishes a list of excluded slots on its R400 chip. A chip that blocks the game you wanted is a smaller chip.

The four ranked casinos are reviewed for the offers and licence lines they publish, not as a promise that a particular slot type is in the lobby today. Start with the casino comparison if you are choosing where to play, and with free spins explained if the coupon is the reason you are opening an account.