Claim: Gary Gygax and Dave Arneson designed Dungeons & Dragons.
Evidence: Dungeons & Dragons -LRB- abbreviated as D&D or DnD -RRB- is a fantasy tabletop role-playing game -LRB- RPG -RRB- originally designed by Gary Gygax and Dave Arneson , and first published in 1974 by Tactical Studies Rules , Inc. -LRB- TSR -RRB-.