To expand, this is a test to see if 'Make it up as you go' can be expanded into RPGs and not just RPs.
If it works for a quick dungeon, then it'll work for a game. If it doesn't, well, it's short.
To expand on The System: The base die of the system is d6. The base number of the system is 3. The base modifier of the system is +/- 1. The base capacity of the system is 12/+4 per minute.
To expand on The Setting: Unless specific otherwise, all characters are humaniods with roughly human capabilities. In addition, all characters are capable of Basic Low Magic: 'Can be used to aid in simple tasks, such as lighting a fire, checking to see if food and water is good, handling domesticated animals and etc.'
On your character sheet, this could be a d6, a 3, a +/- 1 or 9/+4 per minute.
Further expansion as events warrent.