Playing to 105%
You must get all of the gems. The whites and the colored ones. Each level has at least one gem.  Every level has one gem that is obtained when breaking all of the boxes on the level.
You must get all of the crystals.  All of the levels have a crystal and all you need to do is finish the level to get it.
By getting the gems from the two secret levels along with the two relics.
Get the last secret gem only after achieving 104% by spinning on crashes sister (CoCo) in the main area.  *** I haven't gotten this to work, if anyone has please let me know.
 
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