There have also been, at times, additional infinity gems, because why not? (theverge.com)
You see, the premise of the game is very much to collect the 6 infinity gems representing Power, Time, Space, Mind Soul and Reality. (feedspot.com)
The first is a take on your standard Deathmatch, but with the added bonus of Infinity Gems falling occasionally from the sky and boosting a player or team. (egmnow.com)