Click to spawn the selected object E to switch between the objects W and Click to erase hold Q to ignore the grid Space to make the square go As long as what you make is possible the square should reach the end
SAVE SYSTEM : Press K to save, you triple click the numbers in the orange box then press CTRL + C to copy Press L to load, use CTRL + V to paste the copied text from saving, remember to save it somewhere if you wanna load it later