Ball Knowledge (theballknowledge.io) is a free daily sports trivia game. Every prompt has a whole list of right answers, like "name a team that has won the Stanley Cup" or "name a player drafted first overall", and you have 25 seconds to find one. Wrong guesses cost nothing but time. The catch: you're scored on how rare your answer is. Anybody can name the superstar. Naming the backup, the forgotten champion or the one-season wonder is what wins the day.
Each correct answer lands in one of five rarity tiers: Bandwagon (20 points), Casual (40), Real Fan (60), Ball Knowledge (80) and Certified Scout (100), which only the single rarest answer reaches. Rarity starts as an estimate and is re-ranked every night from what real players actually say, so the scores reflect what fans really know.
Answer lists come from official league records, the Olympic results database and standard sports references, and are checked by hand. Spot a missing answer? Let us know.