The Party Games is a mode that contains a couple fun modes, each with some different systems. These are "Rodent Rumble" and "Party Race". This is a multiplayer mode, so you can get up and ask everyone to play with you.
This was the last one to be added in V2 or higher. This wasn't available in first version, as explained in the Mirror Tournament article.
- This mode contains 2 players or more, but less than 5. Unfortunately, this can be controlled in a single computer.