 Sega would go on to release the add @-@ on 's second model , the Sega CD 2 ( Mega @-@ CD 2 ) , on April 23 , 1993 in Japan at a price of JP ¥ 29 @,@ 800 , It was released in North America several months later at the reduced retail price of US $ 229 , with one of the system 's best @-@ selling games , Sewer Shark , as a pack @-@ in . Designed to bring down the manufacturing costs of the Sega CD , the newer model is smaller and does not contain the motorized disc tray used in the initial model . A limited number of games were also later developed that utilized both the Sega CD and the Sega 32X add @-@ ons , the latter of which was released in November 1994 . 
