Cluedo: Discover the Secrets the dagger in UK editions. In addition, an axe, trophy, and poison have been added, bringing the total number of murder weapons up to nine as follows: The nine standard rooms on the board have been changed as indicated by an asterisk (with the original room name in parentheses). In addition to these changes, the center room, "Swimming Pool" (the "cellar" in the original game), is now a playable, accessible room in the game, to be entered by the player prior to making the final accusation. The starting spaces for Scarlet and Mustard have also moved clockwise by 3 positions.
Cluedo wife, Elva Pratt (1913-1990), who had helped in designing the game, presented it to Waddingtons' executive, Norman Watson, who immediately purchased it and provided its trademark name of "Cluedo" (a play on "clue" and "Ludo"; "ludo" is Latin for "I play"). Although the patent was granted in 1947, due to post-war shortages in the UK the game was not officially launched by Waddingtons until 1949. It was simultaneously licensed to Parker Brothers in the US for publication, where it was renamed "Clue" along with other minor changes. There were several differences between the original game concept and that initially published