I never expected to find a website which looks exactly like a Dutch painting from the Golden Age. But never say never, especially if the product to promote is a cheese called the Old Dutch Master.
It's an advergame launched in France where you have to spot seven slices of cheese more or less hidden in the painting.
As Armando says, the gaming mechanism reminds of Virgin Exercise Your Music Muscle but even if the idea is not 100% original, I'm sure you'll still appreciate both the art direction and the engaging way the agency has found to promote a product that isn't particularly exciting like a cheese.
Would be great if someone could leave a comment with the name of the agency.