In a combination of “hey, check this out!” and “I need to file this somewhere for later”, here’s an interesting micro RPG where you create your character through play. Here are the entirety of the rules (I’m not kidding):
Say what you do and roll a number of d6s.
If the sum of your roll is higher than the opposing roll (either another player or the DM), the thing you wanted to happen, happens.
The number of the d6s you roll is determined by the level of skill you have.
At start, you have only one skill: Do anything 1.
If you roll all sixes on your roll, you can get new skill one level higher than the one you used for the action. The skill must be a subset of what happened to you in the action (Say, Athletics 2 if you were climbing a wall, or Teeth of Biting 2 if you were eating a cake).
For every roll you fail, you get 1 XP.
XP can be used to change a die into a 6 for advancement purposes but not for success purposes.
And it’s from here, on Story Games.