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@pampeans
Hi @geli
My strategy was to upgrade the Variants 1st because they reward the most coins and coins are needed to upgrade. Then I focused on the Energon Fueled because they don’t require time to restore their energy. Using both of these character sets increases your skill level. After that I focused on the weakest Tfs. I don’t pretend that this is the best strategy, but that’s what I did.
Having said that, initially I only had to update my characters to level 10 (no materials or Energonicons) and the strategy was to focus on upgrading before unlocking.