Is your brand so well known that people can guess it from a single letter? Logos Quiz for the iPhone and iPad pulls together the logos of the world’s best known brands–can you tell who they are from just a peek? The logos get progressively harder–can you guess what “‘s” is? Perhaps you could if you saw that it was in the iconic Campbell’s font–or perhaps it depends on how fond you are of tomato soup.

Logos Quiz makes you think about why you recognize a company’s logo. Do you love the product? See the logo on countless commercials? Have a soft spot for childhood favorites? Know that it’s a car company, but not which one? Think maybe it’s a computer company?

I stared at the yellow crown logo repeatedly, the answer tickling my brain, but remaining tantalizingly out of reach until Saturday night, when out celebrating Cinco de Mayo I saw a Corona poster. Aha! I now find myself hunting for logos, the better to arm myself as I progress in the game.

Try this trick–take your company’s logo, and cover all but the top right hand corner. Would you know it? Would your target audience?