Snack Attack closely imitates the well-known Pac-Man arcade game which had begun its rise to popularity two years earlier. The player controls a small, white character, moving it through various maze-like levels, gobbling green and purple dots and avoiding the four roaming ghosts. The game's instructions refer to the dots as "gumdrops" and the ghosts as the "Gumdrop Guards." The player uses the J, K, W and S keys to move the character left, right, up or down.
Source: Wikipedia, Snack Attack , available under the CC-BY-SA License.