This series is an update to the classic Pac-Man franchise. The first game, Pac-Man Championship Edition released in 2007 brought a number of innovations to the old-formula:
The gameplay ran on a single game board which was not 'completed' as was the case in the classic Pac-Man, but instead was continually modified and refreshed throughout the game. When either the left or right hand side of the screen had been cleared, an icon would appear on the other half of the screen. Collecting this icon would modify the shape of the cleared maze and re-fill it with dots.
The game was time limited to either 5 or 10 minutes. The object of the game was to score the most points within that time limit. This was a significant change to the original game, which was limited primarily by the number of lives.
PAC-MAN Championship Edition DX, released in 2010 expanded on this formula with the introduction of a number of new innovations:
Several different types of maze
The introduction of a time attack mode where the player had to clear each side of the maze a set number of times as quickly as possible
The introduction of 'push-your-luck' and 'risk vs. reward' mechanics by introducing the concept of 'sleeping ghosts' which are awoken when the player passes by. This results in a long train of ghosts. By building up the train, the player can obtain a big score by eating a power-pellet and then eating the whole train. However eating multiple ghosts speeds up the game, which makes it harder to plan ahead.