File:BTR-editorTileSets.png

There are eight tilesets. It appears they are divided between interior and exterior images.

Pressing X toggles the tiles of the level being edited between four interior and four exterior tilesets.

While editing, pressing F changes between two main tilesets.

Pressing E and then C seems to erase the screen and then change the colours of the tileset.

These colour changes seem to be for convenience because pressing 1,2 and 3 allows you to choose between 16 colours. However in the game, it seems the only ones used are the ones that are contained in the defaults.

Pressing C at any other time changes only the color of the letters / signs.