Mass Effect 3: Easy Reputation
Before you land on planet Gellix to rescue the defected Cerberus scientists you will come across an ex-Cerberus official (Dr. Brown) mourning her husband beside the screen. Talk to her to get +2 reputation. Then, pause the game, and save. Load the saved game file, and Dr. Brown will still be in the exact same position. Talk to her again to get another +2 reputation. You can go on doing this as many times as you want. it’s a bit time consuming but it’ll be worth it in the end. The higher your rep the more perks etc. become unlocked.