Accuracy first, difficulty second, chair values third
Choose the hardest difficulty you can solve consistently. Moving up can award more IQ, but the game does not publish enough data here to promise that a harder tier always produces more IQ per minute for every player. Once your solve routine is stable, compare the multiplier shown on your current chair with the next chair inside the live game. Treat those displayed values as current; avoid charts that cannot show when they were checked.
Verified difficulty, IQ, and chair relationships are separated from missing numbers in the known-versus-unknown table and unknown-rate warning. The action paths, calculator entry, planner, and FAQ also clarify that “100M vs 0” is an entertainment video title, not an official maximum-IQ cap.