d20 System

A big d20 and a little d20. Both roll the same, but the big one costs more and makes a loud thunk when it lands on the table.

The d20 System is a tabletop RPG system that uses, among other things, twenty-sided dice.

Because THAC0 sucked confused stupid people, Wizards of the Coast distilled the essence of the D&D mechanics to a more streamlined mechanic.

Most of the d20 System was released as the System Reference Document (SRD) under the Open Game License (OGL) as Open Game Content (OGC), which allows people to make and release supplements for free. This led to multiple game breaking splatbooks for D&D, and a glut of samey RPGs, mostly because people figured it was worthless to challenge Wizards, and so d20 was soon seen on everygoddamnthing.

Mechanically, d20 is basically a watered down reversed version of the AD&D 2E rules, with huge chunks stolen from Megaversal and SPECIAL, like feats. It works just about as well.

Wizards doesn't use the d20 System any more, as they decided to fail fuck everyone over change the mechanics for D&D 4th Edition. However, there's still hope for people who RAGE at 4e, since Paizo Games pretty much stole 3.5 and renamed it Pathfinder.

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