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In page CP/M:

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The lack of standardized graphics support limited video games, but various character and text-based games were ported, such as Telengard,[5] Gorillas,[6] Hamurabi, Lunar Lander, along with early interactive fiction including the Zork series and Colossal Cave Adventure. Text adventure specialist Infocom was one of the few publishers to consistently release their games in CP/M format. Lifeboat Associates started collecting and distributing user-written "free" software. One of the first was XMODEM, which allowed reliable file transfers via modem and phone line. Another program native to CP/M was the outline processor KAMAS.[citation needed]