LogFAQs > #914788647

My suggestion is to buy the dlc if you havent and immediately start over with Master Mode before you get too invested in your current save. The game becomes exponentially harder and makes you dive into the stealth and cooking aspects right from the getgo if you want even a chance to survive. Its not for the feint of heart though!

Unfortunately you have to start over and cant simply upgrade your current save to the harder difficulty.
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Que sera, sera. Whatever happens, happens.
...and he was never heard from again.