Ok. So I think I figured out the rules. It’s actually not that complicated.
Main Quests:
Collect the Infinity Gems
Spin the Dr. Strange Portal to qualify the mode.
Shoot the portal to start the mode
Shots for the mode flash the color of the gem you’re collecting
If you beat the member of the Black Order you shoot a shot to collect the gem.
The next shot determines which play field shot the gem is placed on to get its benefits
Main Side Quest
Assemble the Avengers - similar to power features in Iron Maiden
If you accomplish all the activities on the LCD, you Assemble the Avengers and start a mini wizard mode.
Mini Quests
Hulk Rampage
Hawkeye Sharp Shooter Modes on the Upper Left Flipper
Computer Awards
Various Power ups or advantages to help with all of the above
Thor Multi-Ball
Started with x amount of hits to the Thor Captive Ball
Iron Man Multiball
Light Iron Inlanes to light the lock at the tower
Shoot Tower to Lock a ball
I’m not 100% certain on these but it seems to be the framework in general