In order to pass this test and get 100% on visual accuracy, you need to solve this puzzle in 30 seconds or less. If you have a timer or an app on your phone, you can set it up now. We’re going to show you the image below, and you can press start on your timer immediately. Ready? Here we go!

This is a typical-looking office space. The room is furnished with a desk, a chair, and a few other objects. Now take a few moments to check if anything stands out as being erroneous. Do you see anything that isn’t quite right?

Okay, here’s a new tidbit. The blunder is hidden somewhere on the desk. Have you spotted the error yet? Take a look at the phone, and perhaps the calendar as well. Have you received it yet? That’s correct! The date on the calendar is incorrect! The calendar says September has 31 days, yet it only has 30.