tileid = tile_add(tlSandBlocks, (ds_map_find_value(global.sand_map, pos) * 16), 0, 16, 16, x, y, -100)
if ds_map_find_value(global.sandcrn0_map, pos)
    tilesandcrn0 = tile_add(tlSandCorners, 0, 0, 16, 16, x, y, -101)
if ds_map_find_value(global.sandcrn1_map, pos)
    tilesandcrn1 = tile_add(tlSandCorners, 16, 0, 16, 16, x, y, -101)
if ds_map_find_value(global.sandcrn2_map, pos)
    tilesandcrn2 = tile_add(tlSandCorners, 32, 0, 16, 16, x, y, -101)
if ds_map_find_value(global.sandcrn3_map, pos)
    tilesandcrn3 = tile_add(tlSandCorners, 48, 0, 16, 16, x, y, -101)