CURRICULUM

Earth History: Four Difficulties, 4000 Levels

Earth History has four difficulties with 1000 levels each and ten questions per level; check the process before choice. History levels ask for eras, fossils or plates; identify the evidence first.

地球演化基础闯关Earth History Basics1000 关地球演化进阶闯关Earth History Intermediate1000 关地球演化高阶闯关Earth History Advanced1000 关地球演化挑战闯关Earth History Challenge1000 关

How it works

  1. Start at the basic difficulty.
  2. Ten questions per level; clear one to unlock the next.
  3. Review at 1/3/7/14/30 days.

FAQ

Which difficulty?

Start at basic and move up when accuracy stays above 80%.

How many levels each?

1000.