Instructions: Click and Drag the window with your mouse to scroll the image.
Diagon Alley final ingame mockup:
Here's another example of the final Diagon Alley background graphics complete with Gringotts bank. I had to stick to a maximum of 1024 tiles simultaneous onscreen using 16 colors per tile.
Which means i could use even more tiles for the complete Diagon Alley tilemap.
HP2 GBA used a system that constantly loaded and unloaded chunks of graphics into memory. This gave me more freedom and space to work with and create more variation and detail in my tilemaps.