-Pro-game-guides:Pro Game Guides' roots began in December 2017 as a passion project of a lone web developer who wanted to write in-depth guides about the games he loved, without wasting readers' time. They provide an extended lists of Roblox Promo Codes, Events and Creator Challenges.
-RockPaperShotGun: you can get a list of the active and expired codes. Moreover you can get some hits about how to redeem Mansion of Wonder promo codes and how to redeem Sonic Speed Simulator codes.
-vg247: very good alternative in which alonside the promo codes is specified the type of the code (accessory, bundle, ecc...)
-robloxcodes.io: the amazing thing about hthis site is that you can check the upcoming promo codes to be released. Promo codes are very well organized.
-pocketgamer: backup site in which you can find the codes in alphabetical order.