There are 4 ISO-8 challenges:
- ISO-8 Challenge - Red: Battle with Thor
- ISO-8 Challenge - Green: Battle with Star-Lord
- ISO-8 Challenge - Blue: Battle with Hawkeye
- ISO-8 Challenge - Materials: Battle with Vision
Note: there is no guarantee that you will receive // in each game. The chance to receive them is about 5% per prize slot on expert difficulty. To improve your chances, play on higher difficulty, use Tsums with the most Luck, and play co-op with Friends.