Pac-Pix

The player uses the stylus to draw Pac-Men, and guide them through each level. Each Pac-Man can eat ghosts when drawn facing them, and can be guided by drawing walls, with the Pac-Man following the direction of the drawn wall when colliding with it. The Pac-Men can also be held back or dragged backwards by repeatedly striking the Pac-Man backwards from its current direction. The size of the hand-drawn Pac-Man will also adjust its speed accordingly (Larger Pac-Men move slower, while smaller ones move faster).

Only up to three Pac-Men can be present on screen at once; the oldest surviving Pac-Man will disappear if a Pac-Man is created while there are three Pac-Men on screen. Pac-Men will disappear if they move off screen or bounce of solid objects too fast.

A wizard invents a substance named Ghost Ink, which creates mischievous-acting ghosts when used. The ink ghosts created by the Ghost Ink cause chaos to the people of Pac-Man's world by jumping into different books and pictures across the world.

Hearing of the crisis, Pac-Man uses his Magic Pen to rid the world of the ink ghosts. Pac-Man succeeds in trapping all the ghosts into a single book, which was then promptly locked. Before he could succeed in turning all the ghosts back into ghost ink, the ghosts counterattack Pac-Man with a curse, which captures him in a sheet of paper. Pac-Man enlists the help of the player to use the Magic Pen to rid the books of the Ghosts. The player uses the Magic Pen to rid the pages from the ghosts by drawing Pac-Men.

Pac-Pix was developed and published by Namco. The game was debuted at the Electronic Entertainment Expo (E3) in 2004 as a technology demonstration for the newly unveiled Nintendo DS hardware. According to producer Hideo Yoshizawa, Pac-Pix was conceived as an arcade game by director Tetsuya Shinoda four years prior. Using Apple personal digital assistants (PDAs), Shinoda noticed how corrected text would disappear with a tiny puff of smoke when crossed out by the user; he found this type of control intuitive and wanted to implement it into a game.

Two years later, the creators pitched the idea as a tablet computer and PDA game, but found the game and the target audience for such hardware did not match. When the DS was announced, Yoshizawa stated that "the time was right". The E3 demo Pac-Pix was met with praise from people within the video game industry, many of which requested it be made into a full game. Namco obliged by putting together a development team, which implemented more effective use of the hardware's two screens.