Kirby's Dream Collection
Kirby's Dream Collection is a compilation of 6 older Kirby titles, a Challenge Stage mode using assets from Kirby's Return to Dream Land, and a History section that goes through the Kirby games throughout the years.
Challenge Stages
Challenge Stages has two speedrun categories, that being All Challenges (essentially Any%) and All Challenges - King Trophy. All Challenges All Challenges - King Trophy
All Classic Titles
The All Classic Titles speedrun is a run which consists of all six classic titles in a row.
This speedrun is typically a yearly event which takes place around the middle of the year. Past races can be seen here.
The leaderboard for All Classic Titles is on the Multiple Kirby Games Leaderboard. Runners can either play all of the games on the Dream Collection disc, or choose to use multiple platforms, separated by category. Runners also have the option to either do Any% or 100% completion of all games. Ability Backups Cheat Sheet
Learning how to run All Classic Titles essentially requires learning the routes of all six games: