Summary
Inspired by Namco's Japan-exclusive arcade puzzle game Cosmo Gang the Puzzle, Pac-Attack shares similarities with other block-stacking puzzle games of the era, like Puyo Puyo.
The goal of the game is to place ghosts and blocks arranged in a three-part L-shaped piece so that Pac-Man, who replaces one of the parts after three or more pieces, can consume as many ghosts as possible to clear the game area. Pac-Man's direction is randomly set to either left or right, but as he moves across the playing field (after you place him, of course), he will change direction if he collides with a block or the game area's "walls."
As Pac-Man eats ghosts and clears rows of blocks, the level difficulty increases, affecting the speed and gravity of the falling pieces, as well as how many pieces appear before Pac-Man appears. If the bottom two parts of a piece cannot be placed in a valid area of the playing field, the game ends. However, by filling a meter on the left side of the screen through ghost consumption, a fairy is summoned in place of Pac-Man. She can fit into any open space and can clear up to seven rows of ghosts; all blocks above the cleared ghosts will then fall accordingly.
The game also includes a Puzzle mode. This mode consists of 100 levels where the objective is to eat all the ghosts using no more than four Pac-Men (this number decreases in some levels), and unlike other modes, you can control Pac-Man's direction by pressing a button.