I got Gears of War 4 for Christmas and it includes redeemable codes for Gears 1-3 and Judgment (Xbox One via backwards compatibility, might also run on Xbox 360 since it's just the 360 games, but the language on the card is unclear). Since I also got the re-mastered version of Gears 1 a year ago, I already have all of these in my library. That's where you come in: you can have these codes.
I'm thinking of a number between 1 and 100. I've written the number on a piece of paper and taken a picture of it with my phone, so I don't forget what it is. You have 47 hours to guess the number - at noon Central time on Thursday 12/29 we'll stop taking submissions. Shortly thereafter, I will announce the winner in the thread and PM the codes to the winner.
I'm assuming these codes are region-locked so you need an Xbox account in the North American region. In the event that there is a tie (for example, someone guessed 2 more than the number and someone else guessed 2 less than the number), the winner will be determined by the order posted in the thread. I won't close it down early if someone guesses the exact number, because I like suspense. I think that pretty much covers it. Good luck!