From the back of the box ...
"Zombies is a new, fast action original arcade game for the Atari."
"ZOMBIES features a dungeon / sorcery motif, and requires 48K RAM. ZOMBIES features scrolling 3-D graphics, online instructions, one-player and cooperative two-player modes, two levels of difficulty, seven different dungeons of varying challenge, a total of 74 different dungeons screens, high score save to disk, full sound and color, zombies, poisonous snakes, giant spiders, evil orbs, scrolls, talismans, magical spells, lost crowns and spectacular under ground scenery."
All of that for a reasonable price of (reduced) 35.99. The sense one has while reading the above description is that this developer, without the backing of some of the larger game development companies, is trying to oversell the game. Everything that is in a standard dungeon-style game is listed and (although, to be fair, this is characteristic of lots of marketing from the period) nondescript features such as "game saving" are also trumpeted.