Wolfenstein II: The New Colossus

You can easily get 4 perks maxed VERY early on!!!! I'm talking like less then 10 minutes into the game!!! There will be 2 key auto-saves to farm these skills.

Environment Kills: After you , he will ask you to arm his traps, as you are heading that way, B.J. will comment about instead of Frau Irene Engel hunting him, he is going to hunt her. Hit the switch to fry the guy to your left, then go downstairs, and turn immediately right. Stealth kill the guy in front of you, (this will give you "Crippled but Able" if you didn't have it before.) then aggro the guy behind the trap to your right. After he gets fried, load up the auto save and repeat. I know it looks like only two enemies at a time, but I think there is more because I got this really quickly!!

Stealth kills: Use the same auto save, but instead of frying the guy on the left, stealth kill him, then go downstairs and stealth kill the same guy again. Load up the auto save and repeat 24 more times.

Combat Takedowns and Overcharged Kill: Just a little further in the game, you're gonna use a giant gear to get to an upper level, grab the health to the right (to make your life hell of a lot easier, make a manual save now). Use to take the 3 enemies out! (make sure the guy to your left actually sees you, or else its just a stealth kill) Repeat till you get to 50 Combat Takedowns. To max out Overcharged Kills, I believe you need 100, I still used this save to farm headshot kills till I maxed out Overcharged Kills..