About Opacitis
Opacitis is a free daily X-ray quiz and radiology puzzle. Each day you get one real X-ray, CT or ultrasound image and a one-line scenario. Name the diagnosis from six options in three tries. Every answer shows what to look for, what else to think of and a teaching pearl. Images are credited under each picture.
How to play
- Look at the image and read the one-line scenario.
- Pick the diagnosis from six options. You get three tries.
- Tap the image to zoom. Each wrong pick reveals a hint.
- Finish to see the findings and a teaching pearl.
Who it’s for
Medical and radiography students, nurses, paramedics, doctors and anyone learning to read X-rays.
Common questions
Is there a free X-ray quiz online?
Yes. Opacitis is a free daily X-ray quiz with a real image every day.
Are the images real?
Yes. They come from Wikimedia Commons and the CDC Public Health Image Library under free licences, credited under each picture. The scenarios are fictional.
Is Opacitis free?
Yes. It's free to play in your browser, with no sign-up, no download and no ads.
When is the new image?
Every day at midnight, Sydney time. Past scans and answers are in the archive.
Past puzzles and answers · All medical games and quizzes
Try next: Glimpsis (spot the diagnosis photo quiz) · Arrhythmix (free ECG quiz) · Anatomegaly (daily anatomy quiz)