 2 @.@ 24 million Sega CD units were sold by March 1996 , after which the system was officially discontinued as Sega shifted its focus to the Sega Saturn . Retrospective reception to the add @-@ on is mixed , praising the Sega CD for its individual offerings and additions to the Genesis ' functions , but offering criticism to the game library for its depth issues , high price of the unit , and how the add @-@ on was supported by Sega . 
