"Gameplay" is a pretty broad concept and can be defined as how the characters in the game are controlled and how the player effects the world, it can also be described how fun the combat or tasks in the game is. innovation in gameplay is important as the same type of gameplay can get very boring, lots and lots of shooting and jumping can get pretty tiring and most people like a change, its important to have a lot of new things to do in a game, half life 2 had its physics engine wich gave you new ways to solve problems, max payne had a slow motion mode that allowed you to defeat enemies in a different way, no matter how small the innovation it adds to the fun and gives each game its own gimmick or reason to play it, the games that stand out are the ones that have well implemented gameplay innovations.

Periphials can be good for gameplay as they give a new way to control the game, lightguns were some of the earliest oddball creations and proved very popular, other ideas include fishing rods, bongos and guitars, these games were popular becasue they were different and well implemented, they were good games because the periphials worked well, although their have been some failures such as the nintendo power glove and virtual boy.
The nintendo wii is a very good example of gameplay innovation and stands out because its slightly crazy but somehow manages to work well and change the way we interact with a game, the graphics aren't quite up to par but it doesn't matter as the games are good.

