File:PKMN GS PROTO SCAN TS Master.png

Cutout from a scan of pages 4 and 5 of 1998 Japanese Gameboy magazine ゲームボーイ obtained from http://web.me.com/celebi23/Spaceworld_97_Pokemon/Japanese_Gameboy_Magazine_Article.html.

The picture was rotated and then a grid put over it to approximate tile boundaries. The shown map's tileset does not fit the found early tileset data, therefore liberties were taken when approximating a mockup for compatibility with the rom's data.

Many magazine articles claim this screenshot originates from a playable copy of the game and that this copy was also playable on the Spaceworld 1997. While this might be true, it would have taken a lot of fine tuning to the the trees behind the bulding to show up in the right place everywhere and would certainly not work with colors instead of greyscale. This whole picture therefore might be a mockup itself or originate from an emulated version of a prototype that was able to use layers, which the game boy cannot.

However, there is another picture showing the same location with different trees and the player standing at a different position originating from some time close after the first screenshot, so it is entirely possible that they planned to have the trees fine-tuned for every occurrence of the roof tops and go with greyscale, presumably before the announcement of the game boy color. The remaining parts of this tileset found in tileset in the production rom do not contain tree parts at the angled roof edges.