Join your favourite Time Lord (every one of them!) as a whole host of puzzling mysteries await . . .

• Which of three possible substances would make the best weapon against a Dalek?
• How can you tell which mannequin is an Auton?
• Where in the universe is the Master hiding?

Travel through space and time, and across worlds, ships and space stations, as you crack clues, make deductions and solve cases.

Using your puzzling powers of logic (plus maybe a sonic screwdriver and some physic paper), it's down to YOU to help the Doctor and their companions fight monsters and save the day.