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This manual explains how the basic game mechanics work and what should be considered for building a good and balanced world.
In DikuMUD as in many other game systems, many checks for success or power of skills and spells are determined by dice rolls.
An open-ended 1d100 roll (1d100OE) forms the basis for most checks. The open-ended rolls works like this:
If you roll 96-100, roll again and add to the previous result (repeat if 96-100). If you roll 1-5, roll again and subtract from the previous result (repeat if 96-100).
A check is generally successful if: (skill + 1d100OE) >= 100.
For example, if your skill is 20, you would generally need to roll 80 or above for success.