lvl 38 , lvl 66 refer to the min hero level required to buy the item Check the lower-left of your screen, where the hero level is displayed. You gain crystals and exp upon completing each code level. Maybe an admin could tell us:
what is the expected hero level upon completing:
-- all code levels on dungeon (no repeated ladder levels)
- all code levels on forest
and so on ...
Besides lvl 66 are not yet implemented items - still under development / test. Making them level 66 ensures nobody can play with them yet