You roll a d20 and then add an attribute and your proficiency modifier. Then you compare the result to the difficulty number.
What is the D20 system?
Fate Point
What is Fate?
AC
What is Armor Class?
Dungeon Master
What is Dungeon and Dragons?
In some games, when you roll the highest result of a die, you get to roll that die to add to the result.
What is Explode?
You form a die pool of d10s by adding your dots in an attribute and a skill together, any die roll of eight or better is a success. Remember, tens explode.
What is the Storyteller system?
Willpower Point
What is World/Chronicles of Darkness?
Storyteller
What is VtM/VtR/WtA/WtF/MtA etc.?
You roll 2d6s and add your stat. Six and below are a failure, seven through nine are a partial success and 10+ is a full success. That's how you resolve you're Moves.
What is Powered by the Apocalypse?
Inspiration
What is DnD
Daily Double!
What is To Hit Armor Class 0?
Handler
What is Delta Green?
What is a Minmaxer/Munchkin?
You roll a red d10 and a black d10, you add your skill and any resources spent to the black die's result, then you compare your profit against the red die's loss to see if you came out ahead.
What is the Profit system?
Strings
What is Monsterhearts/Masks/Thirsty Sword Lesbians?
HASE
What is Hull, Agility, Systems, Engineering
What is Call of Cthulhu?
This is when the GM limits player agency, when its done badly anyway.
What is Rail Roading?
You decide how many points you want to spend from your general ability pool and add that to the roll of a single d6.
What is the Gumshoe system?
Moxie
What is Eclipse Phase?
BECMI
What is Beginner, Expert, Companion, Master, Immortal?
Referee
The sensation of embodying your character. When you feel what your character is feeling, for better or for ill.
What is Bleed?