Defense grid is by far the easiest with the biggest number of potatoes. You just have to type the codes into the console.
From ValveARG Wiki:
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Launch Defense Grid.
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Launch a second instance of Defense Grid.
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In both games click "console".
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In both games log in with user jsharman and password ultraz7x4.
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Type in tonylanche and press enter.
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In the first instance of Defense Grid press 1 so you play first.
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In the second instance press 2 so the computer plays first.
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Replicate the computer's moves from one instance to the other, this essentially plays the computer against itself.
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Eventually, you will win one game and get the login screen.
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Enter deadly lasers at the login screen to get your first potato.
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Enter console and login with twood/GradsNotRads.
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Type: cd inventory and press enter.
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Type: enter_missing_unit. Then enter the password: kungfuhustle.
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Enter console login with twood/GradsNotRads.
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Type: i_beat_tonylanche_for_real.
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Enter the password: eimqufjnrv.
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Beat CHAS with silver or higher (any mode) and earn the achievement "Few and Proud".
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Return to main screen and enter console and login with jsharman/ultraz7x4
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Type: cd recruitment then type: id_scan then type: recruit
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Enter console and login with twood/GradsNotRads.
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Type: cd mutation and then type: mutation
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Breed and get to round eighteen then press "A".
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Enter console and login with twood/GradsNotRads
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Type: cd mutation and then type: mutation
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Breed and get to round thirty-ish (score 3000+) then press "B".