The blue gear turns the way its arrow shows and drives all the others. Gears that touch turn opposite ways. A belt turns both wheels the same way; a crossed belt turns them opposite ways. A small gear fixed on top of a big one turns with it, at the same speed. Where gears touch or share a belt, the smaller one turns faster. Pick the gear the question asks for.
3:00 on the clock, and it only runs while a question is on screen.
Questions get harder as you answer correctly and easier when you miss.
You start at the first level.
Until your first miss, every right answer jumps a whole band. After it, three right answers in a row jump a band, and a miss drops one.
A right answer scores the question's points; a wrong one costs half as many. Guessing does not pay.