World 4 · Complications · 13 min · PRO
Moonphase gears
A gear that counts about 29.5 days
PRO · Clockwork & Time
World 4: Complications is part of PRO
The first world of Clockwork & Time is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly