Monster Gateway is hangman style mini-game for Super Mega Pet. Considered a fifth quest, the quest icon can spawn in the center of the tank at a random, or you can purchase one at the shop. Making this the only quest you can play anytime you want to. Simply press  or [M] after you purchase it from the shop. The game has 75 possible words, each are related to Super Mega Pet such as Ball and Tree.
If you fail to guess the word correctly, the Monster Gateway is opened unleashing one of the most violent and terrible monsters from the Super Mega Pet home world.
If you guess the word correctly, you are rewarded with a valuable ruby coin.