Pac-Man 256 is an official hack of the original Pac-Man starting right before Level 256; not to be confused with the 2015 game.
It was only released in Pac-Man Connect and Play.
Features Pac-Man, Pac-Mania, New Rally-X, Galaga, Galaga '88, Dig Dug, Super Xevious, Rolling Thunder, Dragon Spirit, and Mappy. Additional ROMs for various formats (NES, Game Boy Advance, Atari 2600/7800, etc.) can be added via a Micro SD card.
Slightly modified NES/Famicom versions of Pac-Mania, Dig Dug II, and The Tower of Druaga. Seemingly only released in Canada. A second volume was never released (or announced).
Pac-Man Tilt is a 2D platformer, developed by Namco Bandai Games and released for the Nintendo 3DS in 2011, as one of the included games in Pac-Man & Galaga Dimensions.
Uses a light sensor to project the screen onto a mirror. An alternate, seemingly unauthorized version was produced (by Zeon Tech themselves) titled "Arcade Classic", which features Pac-Man wearing a cowboy hat.