There have been several games released based on the Pern series.
Dragonriders of Pern (board game)
In 1983 Mayfair Games created a board game featuring cards with Pern characters and locations. This game is now rare and valuable to Pern collectors.
Dragonriders of Pern (video game)
In 1983, Epyx released an action-strategy game Dragonriders of Pern (video game) for the Atari 800 and Commodore 64 in which the player could battle Thread and engage in diplomacy on Pern.
Dragon Riders: Chronicles of Pern
In 2001 a video game Dragon Riders: Chronicles of Pern was created by Ubisoft Entertainment for the PC and Dreamcast. This game follows a dragonrider as he Searches for young women to be candidates for Impressing a new gold dragon, and battles the "bad guys" on an adventure across Pern.
Online
A number of online MUD-style games have been created exploring the Pern universe, most notably PernMUSH. These are unofficial and tend to centre on role-playing rather than combat.