4 Fantastic Fish builds ways wins from cash-valued fish, with values growing across the reels. Its respin feature locks fish in place, and a filled reel activates a shark that combines and doubles the values before freeing positions for more fish. A Giant Squid can rearrange fish in the main game and the feature. Big Game prizes are fixed prizes in this original edition, so they should not be described as Relax Gaming's later Dream Drop progressive system.

To compare related slots formats, read the rules of 4 Fantastic Fish GigaBlox and 4 Fantastic Fish Amazon Adventure.

The library also explains the difference between lines, ways and clusters to help put these mechanics in context.

Source: published game information.