Select your three heroes from your roster, then begin the fight. Switch gems to match three or more gems of the same color and the foremost enemy is dealt damage depending on your hero's level. The more gems matched, the more the damage. If you can make more than one match, you will attack more than one time. Each gem is marked with a symbol that indicates which hero does the damage when a match is made (circle is Iron Man, arrow is Hawkeye, lightning bolt is Storm, and hourglass is Black Widow).

Enemies will attack by placing deadly gems that will deal damage if they are not made part of a match within a certain number of turns. The last hero to attack will be the one to take damage from your enemy's turn. You can select an enemy to bring them forward and make them your current target. Try eliminating your stronger enemies first.

Ability Points (AP) increase as you make matches. When they reach a sufficient level for a particular character, you can select their flashing tiles to start a special attack. The color of the flashing tiles determine of the special attack does extra damage, protect your heroes, or have other effects.

Heroes do not heal between battles. Health is restored over time, or filled by healing packs that costs coins.
Create powerful combos by checking which tiles can be cleared with the use of special attacks. The more tiles you take out in a single attack, the more your AP meter will increas. Out of the free characters, Iron Man's attacks are the best.