Project ZM is a work-in-progress vanilla+ hack for the North American (U) Metroid Zero Mission ROM. It is designed to fix errors and add new gameplay routes, tricks and mechanics.

Standard Patch (Proj_ZM_083.ips)
The intended experience for new players.
- In the original game and this patch, some abilities are unknown items -- They cannot be used right away.
- Chozo statues drop hints to keep you on track.

Unknown Items Enabled (Proj_ZM_083_Unk_Enabled.ips)
For experienced players and speedrunners. If this is your first time, do not use this patch. You will be lost.
- Samus' suit can use unknown items.
- Chozo hint statues are removed.
- Item messages can be dismissed faster.
- Instant door transitions.
- Plasma beam deals less damage since it is obtained earlier in the game. (You probably won't even notice anyway)

For more information, visit the Forum thread