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Max Energy is an extreme difficulty stamp in Club Penguin Rewritten. It can be obtained by reaching 9 energy points in Card-Jitsu Fire. It was removed on February 22, 2018 and returned on December 6, 2018.
Multiple penguins have commented that the stamp's official description is inaccurate, considering it is not possible to obtain the stamp by just winning three energy points. Rather, you have to reach nine energy points.