CURRICULUM

Space Exploration: Four Difficulties, 4000 Levels

Space Exploration has four difficulties with 1000 levels each and ten questions per level; check the orbit before choice. Exploration levels ask for Moon, Mars or probes; identify the mission objective first.

空间探索基础闯关Exploration Basics1000 关空间探索进阶闯关Exploration Intermediate1000 关空间探索高阶闯关Exploration Advanced1000 关空间探索挑战闯关Exploration 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.