Atari 2600
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| Name | Hersteller | Nr. | Label | Rarity |
| X Mission | Home Vision | ? | Standard | |
| X-Man | Cosmovision | ? | ||
| X-Man | Universal Gamex | 1005 | Standard | |
| Xenophobe | Atari | CX-26172 | Rot | |
| Xevious | Atari | CX-2695 | - | Prototyp |
| XzentriX 2003 | Eckhard Stollberg | ? | Atari Silber 2 | Homebrew |
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