Population
0
countries in a row — new run resets the streak.
Country A shows its value for a random stat — population, GDP, forest cover, FIFA ranking, and more. Country B shows only a "?".
Call whether Country B is Higher or Lower than Country A. Guess right and B slides up to become the new A, with a fresh challenger loaded below. Guess wrong and the run ends — your streak is the score.
Unlimited rounds. No two consecutive values are ever near-identical, so every call is a real call.