Draft constraint — a rule limiting who you may draft, enforced at pick time.
Pre-1990 players only (60s–80s) — win 50+ games.
Pre-1990 rosters put up huge rebounding and scoring numbers but almost no blocks or steals by modern bookkeeping. Because the win floor here is the lowest of any constraint (50), you can afford to draft for chemistry over raw stats.
Every challenge is scored on the season, not the draft — finishing the roster is not a pass on its own. You get one attempt per day, and the board resets at midnight UTC.
Every player in the world got this challenge on these dates: