This page details one or more prototype versions of Zelda's Adventure.
Properly rip the maps and graphics and compare to the final version.
This prototype is documented on Hidden Palace.
According to the CD's label, this build is Version 1.10 and was made in the second phase of testing. As a result, there are only a few changes between it and the final game. Interestingly, the catalog number on the disc's label, 690 2292, is for the unreleased North American version of the game.
A rather crude registered trademark (®) symbol was added to the logo, seemingly done at the request of Nintendo.
Ganon's name in the Scroll of Shurmak is spelled correctly in the prototype. It was "corrected" to Gannon in the final version for an unknown reason.
Some extra copyright text was added to the demo screen. Because of this, the background and "PRODUCED BY VIRIDIS" text had to be shifted upwards. In addition, a (less crude) ® symbol was added to the logo.
A small part of the river in the Plain of Donora was rotated for the final game.
The cut Alligator Shoes item can be acquired in the prototype. It appears next to the Barachno Marsh merchant, and can be picked up without paying him any Rubies.
This is because of a mechanic that was removed in the final game, in which Zelda's movement speed would be reduced by 50% whenever she's in the Swamp of Vendoss, the marshland bordering the Seacoast Plain. Having the Alligator Shoes in your inventory would restore her walking speed to normal.
An extra Lowder was removed from this North Gubasha Desert map. It is immobilized until Zelda kills another Lowder and leaves and re-enters the area, after which it'll teleport to the center of the map and work properly.