Roger D is a mysterious puzzle designer from Germany, and his actual identity is known only to a few. Roger is known throughout the puzzling world for his extremely difficult and high quality machined aluminium puzzles. Roger's puzzles are produced in relatively small numbers and are highly collectible, they are also sold with no information as to the objective of the puzzles and this is classed as adding an extra degree of difficulty to them.
Primarily Roger's puzzles will have to be obtained from other collectors through puzzle auctions, but very rarely his puzzles do also appear in shops.
As of 2011 Roger D has also now ceased producing puzzles.