Monster Rancher 4

 (knwon as Monster Farm 4 in Japan) a life simulation game developed and published by Tecmo on August 14, 2003 in Japan and on November 13, 2003 in North America for the Sony Playstation 2.

The game revolves around summoning monster by using random CDs or DVDs. The result depends on the specific disc inserted into the console, and some of the monsters requires a specific CD to be summoned. Every monster has a species and a sub-category, all special monsters belong to the ??? sub-category.

The Pandora Disc is a promo disc released with the game that, unlike every other disc, can produce more than one monster, based on breeder rank and time of year and more. Monster Farm 4 Pandora reservation disc acts as a Pandora Disc.