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Rarity calculations are similar to those used by many other rarity sites. If you're interested in the theory behind the rarity calculations, this article gives a very good overview.

Each Cyko Head is ranked by:

• Assigning a score to each attribute based on the number of other Cyko Headz with the same value for the attribute. The exact formula is:
  attribute score = number minted / number with same value
• All attribute scores are summed to give a total score for the Cyko Head.
• Cyko Headz are ranked starting at rank 1 for the highest score (rarest) to lowest score (least rare).

The creators released the above calculations for all Cyko Headz (including those not yet minted) at the time of the drop, so rankings will not change as more Cyko Headz are minted.

The method used here to calculate a Cyko Headz' rarity based on individual attributes, while good, does have some shortcomings:

• At lower rarity levels, where the bulk of the Cyko Headz sit, Cyko Headz can be very different in rank despite having similar scores.
• As the combination of attributes possessed by a Cyko Head aren't considered, the algorithm cannot determine the uniqueness or rarity of the Cyko Head as a whole. If a particular combination of attributes is considered particular rare and valuable, this may not be reflected in the rarity ranking.
• All the Cyko Headz look great and are distinctly different regardless of the rarity ranking, so take this with a pinch of salt.