Xonox

Xonox, a division of K-tel Software, was an American third-party manufacturer of cartridges for the Atari 2600, ColecoVision, Commodore 64, and VIC-20 in the early 1980s. Xonox was one of many small video game companies to fold during the Video Game Crash of 1983.

History
Xonox, based in Minnesota, started developing Atari cartridges during the height of the 2600's popularity. Xonox capitalized on the novelty and perceived value of "double-ender" cartridges. These could be inserted into the console on one of the two ends, each end offering a different game. Different double-ender configurations could package the same game with different counterparts. Xonox was not the first company to try this; Playaround did it earlier with their adult-themed titles. Xonox eventually abandoned this idea and began releasing single versions of some of the titles previously offered as double-enders as well as a few new titles.

Standard cartridges

 * Artillery Duel
 * Chuck Norris Superkicks
 * Ghost Manor
 * Motocross Racer
 * Robin Hood
 * Sir Lancelot
 * Spike's Peak
 * Tomarc The Barbarian

Double-enders

 * Artillery Duel/Chuck Norris Superkicks
 * Artillery Duel/Ghost Manor
 * Artillery Duel/Spike's Peak
 * Chuck Norris Superkicks/Ghost Manor
 * Chuck Norris Superkicks/Spike's Peak
 * Ghost Manor/Spike's Peak
 * Robin Hood/Sir Lancelot
 * Motocross Racer/Tomarc the Barbarian

Standard cartridges

 * Artillery Duel
 * Chuck Norris Superkicks
 * It's Only Rock n' Roll
 * Motocross Racer
 * Robin Hood
 * Sir Lancelot
 * Slurpy
 * Tomarc the Barbarian
 * Word Feud

Double-enders

 * Artillery Duel/Chuck Norris Superkicks
 * Motocross Racer/Tomarc the Barbarian
 * Robin Hood/Sir Lancelot

Commodore Vic-20

 * Artillery Duel
 * Chuck Norris Superkicks
 * Ghost Manor
 * Motocross Racer
 * Robin Hood
 * Sir Lancelot
 * Spike's Peak
 * Tomarc the Barbarian