Cascade slot game is an online slot machine (or a casual game) with unique feature during play. This feature not offers a bonus prizes. It's only other show of symbols. Reels not spin. Symbols fall as a cascade on empty places of a reel (or a side).
Actually the online casinos has two types of games with such feature. One of them are the online casual games (as a rule it's puzzle games, but at the online casinos they also are added in the 'slot category'). Other of them are the online video slots which sometimes name as cascading reels slots.
Conditionally the online cascade games can be divided into two ways to play.
The first way. A game starts, and the symbols fall as a cascade on the places. Winning combinations pay established jackpot.
Example of this way: The Mummy online slot.
The second way. A game starts, and the symbols fall as a cascade on the places. Precisely also the winning combinations pay the prizes. But then winning symbols disappear, and the new symbols refill the surface for new winning combinations. So occurs until all possible combinations will be made.
Example of this way: Cubis puzzle slot game, Bejeweled casual slot game.