With the Games Collection API, you can obtain the fantasy game related information, like the fantasy game name, the Yahoo! game code, and season from multiple games at the same time.
To refer to a Game resource, you'll need to provide a game_key, which will either be a game_id or game_code. The game_id is a unique ID identifying a given fantasy game for a given season. A game_code generally identifies a game, independent of season, and, when used as a game_key, will typically return the current season of that game. For instance, the game_code for the Free NFL game is nfl; using nfl as your game_key during the 2014 season would be the same as providing the game_id for the 2014 season of the NFL game (331). As of the 2010 seasons, the Plus and Free games have been combined into a single code. If you always want the current season of a game, the game_code should be used as a game_key.
You can find a list of common game_ids in the official Yahoo! Fantasy Sports documentation for the game resource.