user comment: This is the original 2006 release of the printed manual for 4D&T. from wikipedia: As a successor to 3D&T, a new system named 4D&T was published in 2006 by Editora JBC (Brazilian publisher of manga). It completely dropped 3D&T's own fast, simple system in favour of the d20 System. Although it has succeeded on its own, it has been poorly received by 3D&T players, given the original purpose of the system was to be as simple as possible. Source: Wikipedia, "4D&T," available under the CC-BY-SA License. from the manual: Mecânica de Jogo Apesar da variedade de regras que você encontrará nos próximos capítulos, 4D&T se baseia em uma mecânica de jogo simples que funciona na maioria das situações. Toda vez que seu personagem tentar realizar uma ação, você irá: • Rolar quatro dados (4D); • Adicionar ao resultado os modificadores adequados; • Comparar o resultado a um número-alvo, determinado pelo Mestre ou pelas regras. [english translation] Game Mechanics Despite the variety of rules you will find in the following chapters, 4D & T is based on a simple game mechanic that works in most situations. Whenever your character attempts to perform an action, you will: • Roll four dice (4D); • Add the appropriate modifier to the result; • Compare the result to a target number, provided by the Gameaster or by the rules. user comment: 4D&T adopts the character structure and most game mechanics of the d20 System &endash;target numbers, six ability scores, class-and-level, OGL license, etc.&endash; but retains the use of six-sided dice (4d6) instead of the eponymous d20.