Its influence

Complete set of dice for Dungeons and Dragons
Dungeons and Dragons was the first roleplaying game, establishing many of the canons and conventions that dominate the genre to this day. Of particular notoriety was the use of multi-sided dice, character sheets, the progressive development of characters and the dynamics of play focusing on the joint action of a game director tells the story of a few players and that the influence and modfican with their actions.
The elements that made Dungeons and Dragons can be seen in many other pastimes of the time, but have existed from before. The interpretation of roles in fictional characters, for example, can be found in historical recreation and theater improvisation. The simulation of game world has been widely developed in war games miniatures. Characteristic elements of the fantasy games specifically designed for the games can be seen from table Glorantha and Tekumel, among others. In the end, however, Dungeons and Dragons represent the final and unique union of all these elements, creating its own niche and starting the development of a multitude of other RPGs. Science fiction, horror, superheroes, cartoons, westerns, spies, and many other fictional scenarios were developed for these.
Over the years, many players have criticized various aspects of the rules of Dungeons and Dragons. Note that the system THACO (To Hit Armor Class Zero, the combat system ADandD version) is very minimal and was designed to try to provide the maximum playability and speed. Certainly it is quite unrealistic and quite illogical at times, which has been widely criticized. The magic system used in the game also has been questioned for similar reasons. These shortcomings motivated others to start the research and experimentation with systems that better reflect the realities of the game. And just as prompted attempts to improve the game that shows the different versions of it.
The search for solutions to these problems led to other game designers to expand and modify aspects of the game. Just months after the emergence of Dungeons and Dragons, new writers and designers began to publish their own role plays. The first to arrive, and that caused a lasting influence, are RuneQuest, published by Chaosium in 1976, and the game of science fiction Traveler, published by Game Designers’ Workshop in 1978. Some systems include later Cthulhu Call of Chaosium, Champions by Hero Games, GURPS, by Steven Jackson Games, Vampire: the masquerade, by White Wolf. These games also provide feedback on their origins, miniature war games, in games like Battletech, Mage Knight, Warhammer Fantasy Battles and Warhammer 40,000. Collectable card games like Magic: The Gathering, were also heavily influenced by his legacy.
With the launch of the third edition of Dungeons and Dragons, Wizards of the Coast d20 system made available free to other designs under the Open Gaming License or OGL and d20 Trademark License. Under these licenses, authors can use the system to create their own games and supplements. Both licenses have also been responsible for allowing the emergence of new versions of old games such as Call of Cthulhu.