Although it is possible to acquire a monster in-game, the series is known for the ability to acquire new monsters using Compact Discs (CDs). Players can use any readable CD, and the game creates a monster using the data stored on it. Certain CDs would result in unique monsters: for example, some Christmas music albums will give the player a monster of type "Santa". Once the player has two or more monsters in reserve, they can be combined, creating a new monster with traits of both 'parents.'
Once the player has a monster, it can then be raised to be a fighting machine. There are six stats that determine how the monster does in battle: Power fuels physical attacks, Intelligence fuels and defends against energy attacks, Life determines monster's hit points, Skill affects accuracy, Speed helps evade opponents' attacks, and Defense reduces damage received from physical attacks. Monsters train either by doing chores nearby, or can be sent to be trained by experts, where they ha...
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