Undercover: Operation Wintersun is an adventure game developed by Sproing Interactive Media and published by Lighthouse Interactive. It was released in North America on September 4 2007. The player is placed in control of Dr. John Russell a British nuclear physicist who is charged with finding German atomic weaponry undercover by MI-6. The game features a number of puzzles which the player must solve to progress and the professor is required to use items that he has picked up throughout his exploration. Undercover: Operation Wintersun received mixed reviews from critics; it received a 57% and a 62.80% from Metacritic and GameRankings respectively. Much of the criticism focused on the game's difficulty. A spin-off Undercover: Dual Motives was published by ANACONDA on the Nintendo DS in Germany in 2007.