Choose any game, for example European Roulette:
http://www.askgamblers.com/en/game/info/European%20Roulette
Click on it and you’ll see all casinos which offering European Roulette. There are currently more than 100 different European Roulette games from more than 100 different providers and casinos.
So, European Roulette is type of game which we have 962, but there are 100 different European Roulette games in that one game type, and we have 3560 games in total. So far 
I hope it’s clear now.