"Pac-Man Party" 2009 Xbox 360 Prototype

Recently, ‪@realduffman117‬ shared footage of an Xbox 360 game prototype disc labeled "Pac-Man Party" and dated at January 26th, 2009. According to them, the disc was discovered in a devkit, and may not work on a normal or modded 360.
The game consists of a build of Pac-Man Championship Edition with multiplayer functionality for up to 4 players, plus a variety of debugging features. It is likely that this is some of the earliest work done on Pac-Man Battle Royale, as it is a 4-player arcade game heavily based on Championship Edition.
That said, there are multiple modes of play in this prototype.
Face Off mode - a "last one standing" mode where each player starts with 5 lives
United mode - a co-op mode where you can save a Pac-Man if they are struck by a ghost. This is particularly interesting because this style of play would eventually be used in Pac-Man Championship Edition 2 Plus
Party mode - a mode with four Pac-Men roaming the maze
Single mode - vanilla Pac-Man Championship Edition gameplay

[@BellHillMayor]

I've wished Championship edition had this

[@Pacman.3129]

What game is that i want to play