This simple hack replaces Mario with Miles "Tails" Prower from the Sonic the Hedgehog series. This is only a simple sprite hack, so no new abilities are added. All sprites are replaced by new ones created by me. I'm planning to use these sprites in a bigger hack later on. Enjoy!
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698