void Start()
{
// Get a reference to Grids 2D System's API
grid = Grid2D.instance;
for (int k = 0; k < 100; k++)
{
int cellIndex = Random.Range(0, grid.numCells);
Color color = new Color(Random.value, Random.value, Random.value);
grid.CellSetSprite(cellIndex, color, sprite);
}
}