Board Thread:Questions and Answers/@comment-35325345-20180507104216

Is the cat evolution progress linear or related to the upgrading cost? Example: Upgrade of a super rare cat level 14-15 = 49600 XP; level 19-20 = 596000 XP. Is the progress between the levels 14-15 vs 19-20 equal (and only much more expensive in the second case) or > 10 times higher in the second case? 