Welcome to the thread for the frugal gamer in everyone.  OP will be updated regularly to capture the month's latest GwG offerings on both the Bone and the 360.

2013
June
Xbox 360 - Fable III (not technically GwG but it was the freebie that kicked it all off)
July
Xbox 360 - Defense Grid: The Awakening/Assassin's Creed II
August
Xbox 360 - Crackdown/Dead Rising 2
September
Xbox 360 - Magic: The Gathering – Duels of the Planeswalkers 2013/Tom Clancy's Rainbow Six: Vegas
October
Xbox 360 - Might & Magic: Clash of Heroes/Halo 3
November
Xbox 360 - A World of Keflings/Iron Brigade
December
Xbox 360 - Gears of War/Shoot Many Robots

2014
January
Xbox 360 - Sleeping Dogs/Lara Croft and the Guardian of Light
February
Xbox 360 - Dead Island/Toy Soldiers: Cold War
March
Xbox 360 - Sid Meier's Civilization Revolution/Dungeon Defenders
April
Xbox 360 - Hitman: Absolution/Deadlight
May
Xbox 360 - Dust: An Elysian Tail/Saints Row: The Third
June
Xbox One - Halo: Spartan Assault/Max: The Curse of Brotherhood
Xbox 360 - Dark Souls/Charlie Murder
July
Xbox One - Guacamelee! Super Turbo Championship Edition
Xbox 360 - Gotham City Impostors/Battleblock Theater
August
Xbox One - Crimson Dragon/Strike Suit Zero
Xbox 360 - Motocross Madness/Dishonored
September
Xbox One - Super Time Force
Xbox 360 - Monaco: What's Yours Is Mine/Halo: Reach
October
Xbox One - Chariot
Xbox 360 - Battlefield: Bad Company 2/Darksiders II
November
Xbox One - Volgarr the Viking
Xbox 360 - Viva Piñata: Trouble in Paradise/Red Faction: Guerrilla
December
Xbox One - Worms Battlegrounds
Xbox 360 - The Raven: Legacy of a Master Thief/SSX

2015
January
Xbox One - D4: Dark Dreams Don’t Die
Xbox 360 - MX vs. ATV: Alive/The Witcher 2: Assassins of Kings
February
Xbox One - #IDARB
Xbox 360 - Brothers - A Tale of Two Sons/Sniper Elite v2
March May
Xbox One - CastleStorm: Definitive Edition
Xbox 360 - Mafia II/F1 2013
June
Xbox One - Massive Chalice
Xbox 360 - Just Cause 2/Thief
July
Xbox One - Assassin's Creed: Black Flag/So Many Me
Xbox 360 - Plants vs. Zombies/Gears of War 3
August
Xbox One - Metal Gear Solid V: Ground Zeroes/How to Survive: Storm Warning Edition
Xbox 360 - Metro 2033/Metro: Last Light
September
Xbox One - The Deer God/Tomb Raider: Definitive Edition
Xbox 360 - Battlestations: Pacific/Crysis 3
October
Xbox One - Valiant Hearts: The Great War/The Walking Dead Season 1
Xbox 360 - Metal Gear Solid V: Ground Zeroes/The Walking Dead Season 1
November
Xbox One - Pneuma: Breath of Life/Knight Squad
Xbox 360 - DiRT 3/Dungeon Siege III
December
Xbox One - The Incredible Adventures of Van Helsing/Thief
Xbox 360 - Castlestorm/Sacred 3/Operation Flashpoint: Dragon Rising

2016
January
Xbox One - Killer Instinct: Season 1 Ultra Edition/Zheros
Xbox 360 - Dirt: Showdown/Deus Ex: Human Revolution
February
Xbox One - Hand of Fate/Styx: Master of Shadows
Xbox 360 - Sacred Citadel/Gears of War 2
March
Xbox One - Crimes and Punishments: Sherlock Holmes/Lords of the Fallen
Xbox 360 - Supreme Commander 2/Borderlands
April
Xbox One - The Wolf Among Us/Sunset Overdrive
Xbox 360 - Dead Space/Saints Row IV
May
Xbox One - Defence Grid 2/Costume Quest 2
Xbox 360 - GRID 2/Peggle
June
Xbox One - Goat Simulator/The Crew
Xbox 360 - Super Meat Boy/XCOM: Enemy Unknown
July
Xbox One - The Banner Saga 2/Tumblestone
Xbox 360 - Tom Clancy’s Rainbow Six Vegas 2/TRON: Evolution
August
Xbox One - WWE 2K16/Warriors Orochi 3 Ultimate
Xbox 360 - Spelunky/Beyond Good & Evil HD
September
Xbox One - Earthlock: Festival of Magic/Assassin's Creed Chronicles: China
Xbox 360 - Forza Horizon/Mirror's Edge
October
Xbox One - Super Mega Baseball: Extra Innings/The Escapists
Xbox 360 - MX vs. ATV: Reflex/I Am Alive
November
Xbox One - Super Dungeon Bros/Murdered: Soul Suspect
Xbox 360 - The Secret of Monkey Island: Special Edition/Far Cry3 Blood Dragon
December
Xbox One - Sleeping Dogs Definitive Edition/Outlast
Xbox 360 - Outland/Burnout Paradise

2017
January
Xbox One - World of Van Helsing: Deathtrap/Killer Instinct: Season Two Ultra Edition (includes Killer Instinct 2 Classic)
Xbox 360 - The Cave/Rayman Origins
February
Xbox One - Lovers in a Dangerous Spacetime/Project CARS
Xbox 360 - Monkey Island 2: LeChuck's Revenge/Star Wars: The Force Unleashed
March
Xbox One - Layers of Fear/Evolve: Ultimate Edition
Xbox 360 - Borderlands 2/Heavy Weapon
April
Xbox One - Ryse: Son of Rome/The Walking Dead: Season 2
Xbox 360 - Darksiders/Assassin's Creed: Revelations
May
Xbox One - Giana Sisters: Twisted Dreams – Director's Cut/Lara Croft and the Temple of Osiris
Xbox 360 - Star Wars: The Force Unleased II/LEGO Star Wars: The Complete Saga
June
Xbox One - Speedrunners/Watch_Dogs
Xbox 360 - Assassin's Creed III/Dragon Age: Origins
July
Xbox One - Grow Up/Runbow
Xbox 360 - Kane & Lynch 2: Dog Days/LEGO Pirates of the Caribbean
August
Xbox One - Slime Rancher/Trials Fusion
Xbox 360 - Bayonetta/Red Faction: Armageddon
September
Xbox One - Forza Motorsport 5/Oxenfree
Xbox 360 - Hydro Thunder Hurricane/Battlefield 3
October
Xbox One - Gone Home: Console Edition/The Turing Test
Xbox 360 - Rayman 3 HD/Medal of Honor: Airborne
November
Xbox One - Trackmania Turbo/Tales from the Borderlands
Xbox 360 - NiGHTS into dreams.../Deadfall Adventures
December
Xbox One - Warhammer: End Times - Vermintide/Back to the Future: The Game - 30th Anniversary Edition
Xbox 360 - Child of Eden/Marlow Briggs and the Mask of Death

2018
January
Xbox One - The Incredible Adventures of Van Helsing III/ZOMBI
Xbox 360 - Tomb Raider: Underworld/Army of TWO
February
Xbox One - Shadow Warrior/Assassin's Creed Chronicles: India
Xbox 360 - Split/Second/Crazy Taxi
March
Xbox One - Trials of the Blood Dragon/SUPERHOT
Xbox 360 - Disney Pixar Brave: The Video Game/Quantum Conundrum
April
Xbox One - The Witness/Assassin's Creed Syndicate
Xbox 360 - Cars 2/Dead Space 2
May
Xbox One - Super Mega Baseball 2/Metal Gear Solid V: The Phantom Pain
Xbox 360 - SEGA Vintage Collection: Streets of Rage/Vanquish
June
Xbox One - Assassin's Creed Chronicles: Russia/SMITE Gold Bundle
Xbox 360 - Sonic & All-Stars Racing Transformed/LEGO Indiana Jones 2: The Adventure Continues
July
Xbox One - Assault Android Cactus/Death Squared
Xbox 360 - Virtua Fighter 5 Final Showdown/Tom Clancy's Splinter Cell Conviction
August
Xbox One - Forza Horizon 2 10th Anniversary Edition/For Honor
Xbox 360 - Dead Space 3/Disney Epic Mickey 2: The Power of Two
September
Xbox One - Prison Architect: Xbox One Edition/Livelock
Xbox 360 - LEGO Star Wars III: The Clone Wars/SEGA Vintage Collection: Monster World
October
Xbox One - Overcooked/Victor Vran
Xbox 360 - Stuntman: Ignition/Hitman: Blood Money
November
Xbox One - Battlefield 1/Race The Sun
Xbox 360 - Assassin's Creed/Dante's Inferno
December
Xbox One - Q.U.B.E. 2/Never Alone (Kisima Ingitchuna)
Xbox 360 - Dragon Age II
Xbox - Mercenaries: Playground of Destruction

2019
January
Xbox One - Celeste/WRC 6
Xbox 360 - Lara Croft and the Guardian of Light/Far Cry 2