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Cool Jewels is a Williams Interactive/WMS slot built around the original Exploding Pays mechanic. The game uses a 6×6 grid, cascading symbols, special wild interactions and free spins instead of traditional fixed paylines. You can try the Cool Jewels slot free online here with virtual credits and no download.
Cool Jewels slot overview
Williams Interactive launched Cool Jewels as the first online slot using its Exploding Pays engine. There are no conventional paylines. A win is created when four or more matching symbols connect in a group. Winning symbols then explode and new symbols fall into the empty positions, creating the possibility of another win from the same original spin.
- Provider: Williams Interactive / WMS
- Layout: 6×6
- Pay system: Exploding Pays / cluster-style wins
- Winning group: 4+ matching symbols
- Features: cascading symbols, multiple wild types and free spins
- Release: 2014
- Commonly published RTP: around 96.10% — check the active game build for the exact value
How Exploding Pays works
Instead of counting wins along lines, Cool Jewels looks for connected groups of identical symbols. When a qualifying group lands, those symbols are removed in an explosion and the remaining symbols cascade downward. New symbols then enter the grid. If another qualifying group forms, the process can continue without requiring a new paid spin.
This mechanic is the core reason Cool Jewels plays differently from classic reel slots. It also makes the special wild symbols more important, because different wild combinations can affect the grid in different ways and create additional opportunities during the cascade sequence.
Cool Jewels free spins
Free spins are one of the main bonus features. Published game documentation describes four or more Bonus symbols as the trigger for the free-spins feature. The exact number of awarded spins can depend on the number of bonus symbols and the game configuration, so the in-game help screen should be used as the final reference for the version currently loaded.
Searches such as Cool Jewels free spins are therefore closely tied to the game’s Exploding Pays mechanic: the same cascading system remains central to how wins develop, while bonus symbols provide access to the extra-spin round.
Cool Jewels wild symbols
Cool Jewels includes several wild behaviours rather than a single basic substitute symbol. Williams Interactive’s original game descriptions highlight wilds that can interact when they appear next to one another. Matching wild types can create a locked or persisting wild effect, while different wild types can combine for stronger effects. This feature layer is designed to work together with the cascading grid.
Cool Jewels RTP
Several current slot databases publish Cool Jewels at approximately 96.10% RTP. Because older WMS/Williams Interactive titles can be distributed in different configurations, verify the exact RTP in the help or paytable of the version you are using for real-money play. RTP is a long-term theoretical return and does not predict what will happen during a short session.
Play Cool Jewels free online
The demo on this page lets you learn the 6×6 grid, exploding groups, cascades, wild interactions and free-spin trigger using virtual credits. No software download is required. Demo wins have no cash value and cannot be withdrawn.
Cool Jewels FAQ
Can I play Cool Jewels for free?
Yes. This page provides a free-play browser version using virtual credits.
Does Cool Jewels use paylines?
No. It uses Exploding Pays: groups of four or more matching symbols can form wins.
Who developed Cool Jewels?
The online game was launched by Williams Interactive, part of the WMS/Scientific Games family.
How do Cool Jewels free spins trigger?
Published game descriptions identify four or more Bonus symbols as the free-spins trigger. Check the loaded game help for the exact award in your version.
