This is a paid asset, but now you can download RPG Overworld Tileset for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
RPG Overworld Tileset v1.0
Create grand overworlds and maps, perfect for JRPGs, roguelikes, SRPGs, tactics and strategy games. Royalty free commercial and personal license.
Over 500 unique tiles with additional animated water effects.
Clean, crisp hand pixeled style.
Versatile tile set with rivers, lakes, estuaries, hills and mountains, scattered trees and lush forests.
5 biomes with transition tiles: Temperate, desert, arctic, swamp and wasteland.
Modern tile variations for buildings, roads and other structures.
Build sprawling cities and tiny villages with buildings, castle walls, stockades, roads and cobble stones.
Please leave a comment if you find this tileset useful as well as any feedback or requests for tiles you would like to see added.
There’s a folder in the zip file called “NoAlpha” which has versions of all the tileset layouts without alpha blending, just fully opaque or fully transparent pixels. You can use these to make a bitmask by filling in the transparent pixels with your 0 value colour and all the solid pixels with your 1 value colour (or the other way round, depending on how you’re doing things).
The shadows that are designed to be drawn with transparency have the RGB value #664d8b (102,77,139), so if you’re doing alpha blending through bitmasking you can fill all these pixels with whatever value of greyscale you want depending on how transparent you want the shadows to be (I used 0.37 in the tileset).
The tiles are 16×16 pixels in size and (I think) RPG maker is locked to 48×48 pixel tiles, so you could blow up the tiles to three times the size with an image editor if you don’t mind having big, chunky pixels.