CouchLord0510: the basic mechanic of the game is to:
1) Roll
2) Remove matches
3) Determine success or failure
4) Determine stress
First, you roll a number of d6s. You will roll 1 or more positive dice, and 1 or more negative dice (sometimes the GM will refer to these as black and white, instead). When you roll here on GP, you'd do two sets of rolls: positive, and negative. You will always roll at least one positive and one negative.
Second, after a roll, remove any matched pairs between positive and negative dice. For example, if you rolled 2d6 positive and 1d6 negative and got
Positive: 1, 5
Negative: 5
You'd remove the 5s and be left with a positive 1, no negative.
Third, you compare the remaining positive result(s) - if any - to the appropriate stat. Your character has a set of 6 stats, divided into 3 categories: the Physical Stats (Dexterity, Vitality), the Mental Stats (Logic, Will), and the Social stats (Charisma, Empathy). If, after removing any matches, there is a positive result that is equal to or less than the associated stat, then you succeed. If the positive result(s) are higher than the stat - or if you end up with no positive results - then you fail.
Fourth, if you end up with any negative results, you get a point of stress in that category for each negative result remaining, regardless of whether you succeeded or failed in the task.
For example, rolling a Dexterity test against a DEX of 3:
Positive: 1, 5, 6
Negative: 1, 3, 4
The 1s would be removed. The positive results that remain (5 & 6) are both above the DEX score of 3, so the character failed the task. In addition, the character has two negative results remaining (the values don't matter), which means that the character takes 2 points of physical stress.