Every video slot has a certain number of winning combinations, i.e. 3 or more identical symbols located on a payline. In addition to these combinations, many video slots have special features that make them more interesting and attractive to players. The most known features are Wild symbol that substitutes for any symbol on a payline, and Scatter symbol that unlocks free spins and bonus games. There are many more features that can be divided into groups, which you can see below. Some features are symbol-based: Mega Symbols, Symbol Hold, Stacked Symbols, etc. Other features are reel-based: Every Symbol is Reel, Respins, Shifting Reels, Reels Hold, and more.
There are also special features like Nudge feature that allows you to move a symbol into the paying line, Way Wins feature that makes a cluster of adjacent symbols a winning combination regardless of the payline, Cascading Symbols or Tumbling Reels, and more. Below you can see the lists of online casino video slots by special feature.