Starburst review
Starburst is probably NetEnt’s most famous slot, released on 23 January 2012. The studio calls it a staple of online casino portfolios worldwide, and fourteen years on it still hasn’t left the lobbies. Five reels, three rows and just 10 paylines make up the layout, and the game is deliberately simple: everything revolves around expanding Wilds and respins, with no free spins at all. That simplicity is exactly why it works as a reference point for judging more complicated games.
Its space theme with gems, BAR symbols and lucky sevens, calm soundtrack and clean design have made it a fixture in casino lobbies worldwide. Five colours of gem glow against a dark starfield, so every symbol reads clearly. When the Wild lands, NetEnt describes it as scattering clones of itself around the reel until the whole column is covered, which is the one flashy moment in an otherwise restrained presentation.
Both-way lines and an expanding star
Three matching symbols on a line are enough for a payout. Starburst’s twist is that lines pay both ways, left to right and right to left, so each line effectively works twice. Coloured gems are the low-paying symbols, while the seven and BAR pay the most.
Three gems on reels 3–5 pay from the right edge even when the first two do not match. Checking both directions is already part of RTP; it does not automatically double every line. The exact treatment of one full five-symbol match in both directions is unspecified here.
The star Wild lands only on reels 2, 3 and 4, expands over the whole reel and substitutes for paying symbols. It has no pay of its own and does not open a separate bonus.
Expansion covers every position on its reel, putting the Wild on every line. With all three middle reels wild, either edge symbol forms four of a kind on each line; matching edges can form five. The value depends on the edge symbols rather than a pay of the star itself.
Free respins with locked reels
An expanded Wild locks while the other reels spin again at the original stake without another charge. A new star on an unoccupied middle reel also expands, stays and adds a respin. The described limit is three respins; the chain ends without a new star or after using the available middle reels. Each step’s payouts are counted separately and added to the paid round total.
A correctly counted example: the paid spin lands a star on reel three. Respin one adds one on reel two. Respin two lands no new star and ends the chain. That is one paid spin plus two free ones, with two central columns still wild on the last. The first star does not guarantee further ones.
Return, hit rate and series variants
RTP is 96.08%, volatility low and the maximum 800x. NetEnt lists payouts on about 23% of spins; a hit is not necessarily a profit because it can return less than the stake. Star frequency, chain-length distribution, maximum probability and termination at the limit are undisclosed. Low volatility does not guarantee a smooth balance; absent multipliers do not establish the sole route to a maximum round total.
July 2021’s Starburst XXXtreme retains expanding, locked stars but adds random multipliers up to 150x, Random Wilds of one to three stars after a spin and paid XXXtreme Spins with one or two guaranteed stars. Wild buys cost 10x or 95x; RTP is 96.45%, risk high, maximum 16,800x and stakes 0.10–50. November 2024’s Starburst Galaxy changes the structure: a 5×5 grid grows to 7×7, with Avalanche, a feature generator and Galaxy Star. RTP is 96.00%, maximum 17,288x and stakes 0.20–20; its hit rate is described as close to the original without a precise value.
2013’s Twin Spin synchronises reels without free spins: 96.55% RTP, medium volatility and a 1,000x maximum. 2011’s Fruit Shop awards free spins for fruit lines at 96.71% RTP, low risk and an 800x maximum. Starburst vs Twin Spin compares the two mechanics. NetEnt chose one base feature for Starburst despite already producing bonus games. Gates of Olympus uses high volatility and accumulating multipliers instead of fixed stars.
