Super Metroid: Z-Factor

This hack is a complete make over of planet Zebes level-design wise, very few rooms actually look like they used to be. The planet is a little bigger now, it still relies on the original region structure but layed out differently. The gameplay is unchanged, no new abilities or stuff like that.

However, there're numerous small ASM changes, mainly on PLM and enemies so as to keep the player interested in exploring. Item progression and item count has been slightly altered. Sequence breaking is also possible to some extent (might not be as permissive as SM tough)

This is hack is more difficult than the original game but special/advanced techniques are NOT required to beat it.

Source: TheGamesDB