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What is the best upgrade strategy?
I’ve got all the bots at at least Level 7, with a few at Level 9. Is there an optimal strategy for choosing who to upgrade first? I used to be forced by the bugs, but now that I can destroy troublesome levels, it isn’t as bad a problem. Which characters are worth the time to upgrade now vs later? Is it better to rank them all up to 8 and then 9, or should I get each of them to 10 one at a time?
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