Original sentence: After each set of three standard stages and the boss stage you can access a secret stage if you have rescued all 6 Gobbos on the preceeding three standard stages.They contain no Gobbos (or Coloured Crystals therefore) but do contain the standard crystals, of which there is always 50 (Croc 2's boss stages also only have 50 standard crystals collectable, following the same style, and give you the final 50 on defeating the boss -- Croc gives you nothing on defeating a boss)
Edited sentence: After each set of three standard stages and the boss stage you can access a secret stage if you have rescued all 6 Gobbos on the preceding three standard stages.They contain no Gobbos (or Coloured Crystals therefore) but do contain the standard crystals, of which there is always 50 (Croc 2's boss stages also only have 50 standard crystals collectable, following the same style, and give you the final 50 on defeating the boss—Croc gives you nothing on defeating a boss)