In Marvel Agents of Shield, there have lots of Kree patterns. Basically, it’s circles with lines through them.
Currently in a game, the = button at the top gives access to Options / Retreat.
It would be nice to also have Toggle Kree Patterns. By default they are off.
If turned on, a match or cascade would make circles around all gems removed, and a line through all matches. These would fade within a few turns. It should be possible to figure out what happened in a cascade by toggling on the Kree pattern.