Xbox Gamerscore May 2021: How to Join Challenge and Earn 10,000 Microsoft Reward Points Microsoft has once again dangled 10,000 points in Microsoft Rewards after officially opening the Xbox Gamerscore May 2021 challenge. Photo : Lukas Schulze/Getty Images Who wouldn't love playing Xbox games, now with nice, glittering Microsoft Rewards?! Microsoft has brought back the Microsoft Rewards 10k Xbox Gamerscore Challenge, allowing players to earn up to 10,000 Microsoft Rewards points by stacking up a 10,000 Gamerscore through in-game achievements. Beginning Tuesday, May 11 until May 31, players can earn those rewards by unlocking achievements to accumulate their Gamerscore, Windows Central reported. Earning 10,000 Gamerscore won't be that easy though, as even veteran gamers would take time to accumulate it. And with just 20 days to do it, players might need to dedicate more hours for it.