A 6th anniversary hack from the website Insectduel's Domain contains 12 levels without warp zones and halfway mid-points. Bonus levels are limited. Consider this as an anniversary gift celebrating 6 years of Insectduel's ROM-Hacking hobby. Don't expect it to be too easy or too difficult.
ROM requirements:
File Name: Super Mario Bros. (W)
File Size: 40977 (a011)
File MD5: 811B027EAF99C2DEF7B933C5208636DE
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46