Coliseum Side-Quest: Moon Gem Cup
Coliseum Side Quest: Moon Gem Cup (コロシアム外伝「つきの魔石」カップ Koroshiamu Gaiden Tsuki no Maseki Kappu, lit. "Coliseum Side Story Moon Gem Cup"), also called the Moon Gem Challenge, is a recurring series of one quest in Kingdom Hearts Unchained χ / Union χ, in which players can earn rare rewards, including a Moon Gem, by completing objectives. In the Event Quest, players are unable to continue if they run out of HP.
Moon Gem Cup #1
The first Moon Gem Cup was available from September 11 to 18, 2017 in the English version.
Moon Gem Cup #2
The second Moon Gem Cup was available from October 30 to November 3, 2017 in the English version.
Moon Gem Cup #3
The third Moon Gem Cup was available from January 11 to 17, 2018 in the English version.
Moon Gem Cup #4
The fourth Moon Gem Cup was available from March 20 to 31, 2018 in the English version.