NESPrincEd is a Prince of Persia 1 for NES level editor for Windows.
Latest version: https://www.emu-land.net/forum/index.php/topic,66532.0.html
Download version 2.0: NESPrincEd-2.0.zip (662KB)
Download version 1.2.2: NESPrincEd-1.2.2.zip (220KB)
Released by Alexander (aka loginsin, aka ALXR).
To use it, you'll also need to download a NES ROM image.
To change events (door links), use Ctrl + left mouse button; click twice for drop events.
Making of information, in Russian: Ch. 1, Ch. 2, Ch. 3, Ch. 4, Ch. 5, Epilogue.
An old version:
- 1.0.7: NESPrincEd-1.0.7.zip (553KB)