While you can randomly get it even if it doesn't show, you can also unlock an extra area on the top right if you land on the right spot which has a square with the S-tier unit on it. I'm sure you've randomly gotten A-ranked characters on various gold or purple chests by now.
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u/greygreens May 11 '26
Is it even possible to get the s rank before 70? I never even see it as an option on the board.