《怪物超级联盟》(Monster Super League/몬스터슈퍼리그)由韩国4:33(Four Thirty Three)营运、SmartStudy开发制作的手机RPG新作。《怪物超级联盟》收录包括可爱的动物系、帅气的人型系、成长后会有不同改变的混合系等多达550种以上有着各式各样不同特征的怪物星兽登场，是一款让玩家们来自由收集培育的怪物收集养成型RPG游戏。

Example: I was trying to collect a rare "dark gatito" astromon which could only be obtained through the "fusion" system using the limited-time "seasonal" wood and water element "gatitio" that were available for 2 weeks only. What was NOT clear was that the fusion of "dark gatito" itself must ALSO happen during the limited 2 week period or "dark gatito" would no longer be available. So despite having caught the wood and water "gatito", I am not able to get dark "gatito" simply because it is now outside the 2 week date range, a fact which was announced AFTER THE MAINTENANCE THAT REMOVED THE DARK GATITO FUSION OPTION.
If the developers work out some of the stability issues and make it easier/more clear about the process of getting rare/seasonal astromon, especially if there are special time limitations, I would be happy to give this a higher star rating but in the mean time I would recommend trying a different game that has been out longer and has more of the kinks smoothed out.