Combined, these releases let you collect more than 300 engaging monsters from up to 11 monster families as you explore strange and mysterious worlds. Each version offers exclusive monsters and items. While these games play fine by themselves, you'll need to link up or purchase both to collect all the items and creatures. Each title has different hidden quests accessible only with secret keys. Trade keys to uncover the mysteries contained in both titles. Best of all, it's up to you to breed the most powerful monster by customizing it with magic abilities and inherited skills. Link to another system to fight your friend's monsters or join up to fight as a team!