You need to select a TILE beside selecting the TERRAIN you want to use. Once you select the TIles, the BLOCK tab in the lower left will change to tile and you can click on that tab and it will show them to you. You can also select the tile floater in the TOOLS in the menu bar. When you get done making your tiles, make sure click on SAVE in the lower left window in the TILES tab. This will save the tiles to your map name and placement location where you used them.
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