Crown Upgrade by Phantom Interactive puts a medieval royal theme around a five-by-five reel grid. Ordinary spins follow fixed paylines, while the main bonus turns collecting Bonus symbols into two linked rewards: a larger global multiplier and more spins in which to use it.
Quick take: Bonus-symbol collections give the crown chase both more time and a stronger multiplier.
Theme and Gameplay
The royal imagery gives Crown Upgrade a clear setting, but the practical starting point is the line structure. There are 15 fixed paylines, with combinations paying left to right from the first reel. Matching symbols elsewhere on the square board still need to follow a paying route.
That distinction matters on a grid with five rows. There is plenty of space for matching symbols to appear, so reading the paid lines is more useful than judging a result by how many similar icons cover the screen. Bonus symbols provide a separate target: their count determines which free-spin mode begins.
Slot Features
Three Bonus symbols trigger Crown Bonus, while four trigger Crown Super. Both begin with ten free spins and a 1x global multiplier. The extra triggering symbol therefore changes the mode rather than the initial number of turns.
During either bonus, collecting three Bonus symbols increases the global multiplier and adds three spins. The accumulated multiplier applies to bonus line wins, giving each completed collection a purpose beyond extending the counter. Crown Super has a higher minimum multiplier increase than Crown Bonus, making its collections potentially more valuable.
Bonus Buy also offers direct feature entry. Buying access does not guarantee a profitable round; the line wins and collections during the feature still determine its result.
Feature focus: A completed three-symbol collection improves both the multiplier and the remaining spin count. That pairing matters because the added turns create further opportunities to land line wins at the increased multiplier.
RTP and Win Potential
Crown Upgrade lists 96% RTP, medium volatility and a maximum win of 25,000x the stake. RTP describes a long-term theoretical return, while the maximum is a ceiling rather than an expected bonus result. The medium volatility rating does not make that ceiling a typical outcome.
My Thoughts On This Slot
The strongest idea here is tying extra time to the same collection that improves bonus line wins. An extension has a clear role: it gives the growing multiplier more opportunities to affect a result. That makes the feature easy to follow without reducing it to watching a spin counter fall.
The two bonus modes also have a meaningful distinction despite sharing their starting length. Crown Super's stronger minimum increase gives the fourth triggering symbol a concrete benefit. Someone who prefers every spin to settle independently may find the collection chase less appealing, but Crown Upgrade suits players who enjoy following a multiplier through an extended round.
Final Take: Crown Upgrade gives its royal theme a useful hook: collections that strengthen the bonus and keep it running.