The Gameplay Library is a database. You can browse the game design systems and use it to design your games.
It offers insights on what is the system, when you should use it, where it can implement it, games that featured this system, and genres built on top of this system.
We are populating the database with tutorials and playable demos so people can get a feel about the gameplay systems.
Take a look at the Mega Man X2 gameplay map to get a feel of what we are making:
Click to access the Mega Man X2 Gameplay Map
In my videos, I also present the Gameplay Library, I think is wroth taking a look too: