2018 -Use the arrow keys to move the curser. -Press 'a' to draw a tile -Press 's' to erase a tile.
One of those one-sprite-one-script jigs. This is what the ground tool would almost look like in Super Mario Maker if there was a Super Mario All-Stars SMB1 course style. I broke the tiles up into 8*8 px tiles so they would be more flexible. I did this because I was bored.