Critical Mass: Patriot vs Iron Curtain

The simultaneous action mech-on-mech combat game!

The war lasted one hour and forty-five minutes. No one remembers who fired first, but the outcome was worse than even the starkest of projections imagined. The simultaneous detonation of so many weapons attacked the planet on a sub-atomic level, scouring the atmosphere, boiling the seas, and turning forests to ash. To operate, and survive, in this new, hostile environment, powerful walking war-machines were created…


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2 Players
30 Minutes
Ages 14+

Feast your eyes! One hundred tons of iron and steel fresh from the Detroit Autofacts. The PATRIOT.

Your Mech is represented by a Mech board and its own deck of Combat Cards. The Mech board is the control station for your chosen Mech. On the back of each Mech board is a list of all of your Mech’s cards, and where each card starts during the game.

Every Mech has four Critical Components displayed at the top of the Mech board. If all four of your Critical Components are destroyed, you lose the game. Fortunately, your Critical Components are protected by tough Armor Plates represented by cubes that are placed in slots near each Critical Component. Each plate has a durability that must be met (or exceeded) by weapon damage to destroy it.

Look lively recruit! Sensors have detected an enemy Mech closing on your position… so what do you do? In Critical Mass, the game is played over a series of turns. However, players do not alternate taking turns. Instead, most of the action is simultaneous! Each turn is broken into three steps:


During the plan step, players choose a Combat Card from their hand to play, and place it face down in front of them.

After players have chosen their cards, at the same time, the cards are turned over and revealed.

This is what you’ve been waiting for! Your tactics have been chosen, and it’s time to see what happens! First, each card has a Speed value in the top left corner, and players compare the Speed of each revealed card to determine the order that the cards are resolved.

Weapons deal damage, Defense cards block or evade weapons, special Actions are performed, and Equipment is placed to enhance your Mech. But remember, if you play a weapon card and it does damage, the opposing Mech will be Disrupted!

That means, if the card your opponent played has a lower speed than your weapon card, their card will have no effect. Deciding what to play is an integral part of the strategy in Critical Mass, so choose your cards carefully or you’ll find yourself on the receiving end of a laser barrage!


  • 2 Mech Cockpit Boards
  • 78 Total Cards:
  • 11 Patriot Cards
  • 12 Iron Curtain Cards
  • 49 Customization Cards
  • 6 Targeting Cards
  • 37 Silver Cubes
  • 4 Green Cubes
  • 1 Rulebook
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