The story of SpaceChem takes place on nine different planets (two of which aren't actually planets). Each planet contains a number of assignments that must be solved in order to proceed to the next planet. Most planets end with a special "boss level", a Defense assignment. Some planets also contain optional challenge assignments. The planets are:

  1. Sernimir II
  2. Sernimir IV
  3. Danopth
  4. Alkonost
  5. Sikutar
  6. Hephaestus IV
  7. Atropos Station
  8. Flidais

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