Yeah, I can never get past the Thunderbird.
The only time I ever beat the game was cheating on an emu using savestates.
On my actual cartridge, I maxed out all my levels, and I still suck at the final palace
BTW, when you're maxed out, you still get EXP, and it'll give you a level up, but nothing actually happens. Kind of interesting.
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I'll brave the storm to come, for it surely looks like rain...