Red Market uses its own system, known as the Market System.
Everything is done with two d10s. One black and one red. So you want to be in the 'Black', as Red means you're losing money. Matching numbers are crits. Odd are crit failures. Even are crit successes. And skills, equipment can let players add to the Black die. If the Black after bonuses match Red, its a failure. If the Black succeed the Red, its a pass. Without any bonuses. Players have a 45 percent chance of success on any given roll, and ten percent chance to crit. Roughly 50 percent to succeed.
And then to prevent it from making it into a Backpack Simulator, all items have charges. You gun has ten charges. You get ten use of the gun. Your laptop has 5 charges. You get five uses of the laptop.
And then you have a thing called 'Refresh', which is derived stat, which lets you refresh any one item. Which is your character having foresight in packing extra laptop batteries, or extra food or extra gun.
It is a horror game, so there is a sanity mechanic. There 3 tracks. Detechment, Stress and Trauma. Detechament is where you stop being human. Stress, is just being anxious and no way to relax. And Trauma is when you watch someone screaming as they're being devoured by zombies. Each have 15 boxes, into 5 bands. you get to 'break' 3 times before your character is nuts. Each time the character breaks. They can Fight, Flight or Freeze, then they get an expensive habbit as they cope. EG, they spend Bounty (the games money), on drugs and booze to stop feeling the bad feels and stop remembering the bad rememberings.
And there lots of other neat stuff in there. I like its take on Zombies, and the economy. Like its five years into the zombie apoc. Anyone who is left alive, knows how to deal with zombies. So Zombies arent that bad anymore. They can still get bad. But its much like the Weather. If you live a hot place, you can deal with it being hot, but a heat wave can still be deadly.
Whenever you do something excessively noisy out in the waste, it attracts zombies. Like if you fire a none silence weapon. It attracts zombies. You roll the d10s. the Black determine how close the Zombies are, measured in shambles, and the red determines how many zombies they are. The hoard.