Critical Mass is a fast-paced mech combat game. Players go head-to-head in this fighting-strategy game with deckbuilding aspects. Players choose their favorite mech to battle it out, each mech offering a different loadout of cards to start the game with and unique powers.
Each turn, players plays a card face-down. When both players have chosen a card, they reveal them. Cards resolve based on their speed and if they haven't been interrupted. Weapons deal damage and interrupt the enemy, while defending avoids weapon hits. Upgrading offers you additional cards to add to your arsenal but is vulnerable to being interrupted. Lastly, Recharge reloads spent cards.
As cards are played, they go to their owner's cooldown pile, where they remain until they're reloaded. As players take damage, the armor on their mech is destroyed. When enough armor is destroyed, an armor core becomes vulnerable and can be destroyed to stun that mech for the next turn. The game ends when a mech's armor is completely destroyed, down to the last core.