This refers to the Original Dungeons & Dragons published in 1974. It is truly The One True
Game,
the game that rules all other games and provides more fun and enjoyment than any other game ever devised.
It requires imagination and creativity, that limits
the game to those who are of above average intelligence. It also requires flexible thinking and the ability to make decisions. This disqualifies the rules lawyers, the by the book crowd and the decision challenged.
The One True Game makes a clear distinction between the Old School Gaming and New School Gaming.