The October 31st, 1997 prototype lets you play as Leon only. You can play either of his scenarios, and for the most part you can get through them, but neither of them can be fully completed. Because of the huge amount of differences, I've made several pages about this prototype.

Leon Scenario A
Split into three parts. The first part covers the beginning up to just before you get to play as Ada for the first time. Part 2 goes from playing as Ada to Ada getting injured by Birkin, and the last part covers the rest of the game.
Part 1
Part 2
Part 3



Leon Scenario B
Split into three parts. This retreads a lot of things that were different in the A scenario, but there are also plenty of additional differences, especially towards the end. Part 1 covers from the start up to opening the chess piece plug door, part 2 goes from reuniting with Ada in the sewers to the aftermath of the second Birkin fight, and the last part covers the rest of the game.
Part 1
Part 2
Part 3



Cheats
How to use the debug menu, along with some other secrets.



Item & Weapon differences
Comparisons of the images used for items and weapons in the inventory.



Unused Areas, Items & Weapons
A look at things that can't usually be used or seen in the prototype.



Miscellaneous
A round up of some other differences and oddities.