The Core Mechanic is the way you tell if you succeed at an action. Most actions you take in the world pass automatically. Going to the toilet, opening an unlocked door and combing your luscious beard are all examples of things that have very little random chance of failure. When you want to do something that the Gamesmaster decides has a random chance of failure, you must perform a check like so:
First describe what you're trying to do. If you have any skills that you think are appropriate then tell the Gamesmaster. The Gamesmaster will tell you which Attribute to use and the target number. Add your Attribute, your Skill and a D10. If that sum is the same or more than the target number, then you succeed!
Setting the Target Number
By default, the Target Number is 14. The more difficult the task, the bigger that number will be. The Gamesmaster will use the table below as a guide.
When you roll 1 or 10
No matter how difficult the task, if you roll 1 then that is a critical failure. In this case something bad will happen. The Gamesmaster and other Players get to decide together what the critical failure will look like. If you roll 10 then not only do you succeed but you can decide to do something extra-specially splendid while doing so.
Icar has lots of equipment and guns that can give you a bonus to your roll. Bionics will change your attributes permanently (not always for the better) and equipment will give you a bonus if you're using it to help your action. It's up to you to remember that you have a bonus. As soon as you roll the die, then it's fixed.
Player versus player
When fighting other players, you both sum Attribute, Skill, Bonuses and a D10 and whoever has the bigger number wins.