Question 1

What is The Differential?

Accepted Answer

The Differential is a free, daily clinical puzzle game for doctors and medical students. Each day, a new patient case is presented, and players must reach the correct diagnosis using as few diagnostic tests as possible within a 3-minute timer. It tests and builds diagnostic reasoning and clinical parsimony skills.

Question 2

Who is The Differential for?

Accepted Answer

The Differential is designed for medical students, residents, attending physicians, and anyone interested in the detective work of clinical medicine. It's used to sharpen differential diagnosis skills, practice clinical reasoning under pressure, and learn about disease presentations in a game format.

Question 3

How does scoring work in The Differential?

Accepted Answer

Players start at 100 points. Each unnecessary diagnostic test costs -10 points. Ordering trap moves (clinically misleading tests) also costs -10 points. Time also factors into the final score. Grades are awarded: S (90+), A (75-89), B (55-74), C (30-54), D (1-29). Running out of time results in an F grade and the patient is transferred to the ICU.

Question 4

Is The Differential free to play?

Accepted Answer

Yes. The Differential is completely free to play. There is no account registration required. A new clinical case is published every day at midnight UTC, and past cases are available in the archive for replay.

Question 5

What is clinical parsimony?

Accepted Answer

Clinical parsimony is the medical principle of reaching an accurate diagnosis using the fewest diagnostic tests, procedures, or resources necessary. It avoids unnecessary testing, reduces patient risk, lowers healthcare costs, and is considered a hallmark of excellent clinical reasoning. The Differential rewards parsimony by penalizing redundant or trap diagnostic orders.

Question 6

How often does The Differential release new cases?

Accepted Answer

A new clinical case is released every day at midnight UTC on thediff.icu. All previous cases are accessible in the Archive section for unlimited replay practice.