Lights off puzzle 3x3

if not term.isColor() then
 error("You need an advanced Computer to run this",2)
end
local field = {}
field[1] = {"X","O","X"};
field[2] = {"O","X","O"};
field[3] = {"X","O","X"};
local running = true
local clicks = 0
local slc = 1
--[[
y
^
|
|
|
+----->x
]]

function clear()
term.setBackgroundColor(colors.black)
term.clear()
term.setCursorPos(1,1)
end

function generate()
for i=1,3 do
 for j=1,3 do
  field[i][j] = (math.random(1,2)==1 and "X" or "O")
 end
end
end

function draw()
 clear()
 print("New | Exit | Clicks: ",clicks)
 print()
 if slc == 1 then
  for y=1,3 do
   term.write(" ")
   for x=1,3 do
   term.setBackgroundColor(field[y][x] == "X" and colors.blue or colors.red)
    term.write(field[y][x])
   term.setBackgroundColor(colors.black)
    term.write(" ")
   end
   print()
  end
 else
  print("You won! And it took you "..clicks.." clicks")
 end
end

function check()
 if field[1][1] == field[1][2] and field[1][2] == field[1][3] and
    field[1][3] == field[2][1] and field[2][1] == field[2][2] and
    field[2][2] == field[2][3] and field[2][3] == field[3][1] and
    field[3][1] == field[3][2] and field[3][2] == field[3][3] then
  return true
 else
  return false
 end
end

function update(e)
 if e[1] == "char" then
  if e[2] == "q" then
   running = false
   return
  end
 elseif e[1] == "mouse_click" then
  button = e[2]
  x = e[3]
  y = e[4]
  --click new
  if x >=1 and x <= 3 and y==1 then
   generate()
   clicks = 0
   slc = 1
   return
  --exit
  elseif x >= 7 and x <= 10 and y == 1 then
   running = false
   return
  --click the buttons
  elseif x == 2 then
   if y == 3 then
    field[1][1] = (field[1][1] == "O" and "X" or "O")
    field[1][2] = (field[1][2] == "O" and "X" or "O")
    field[2][1] = (field[2][1] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 4 then
    field[1][1] = (field[1][1] == "O" and "X" or "O")
    field[2][1] = (field[2][1] == "O" and "X" or "O")
    field[2][2] = (field[2][2] == "O" and "X" or "O")
    field[3][1] = (field[3][1] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 5 then
    field[2][1] = (field[2][1] == "O" and "X" or "O")
    field[3][1] = (field[3][1] == "O" and "X" or "O")
    field[3][2] = (field[3][2] == "O" and "X" or "O")
    clicks = clicks+1
   end
  elseif x == 4 then
   if y == 3 then
    field[1][1] = (field[1][1] == "O" and "X" or "O")
    field[1][2] = (field[1][2] == "O" and "X" or "O")
    field[1][3] = (field[1][3] == "O" and "X" or "O")
    field[2][2] = (field[2][2] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 4 then
    field[1][2] = (field[1][2] == "O" and "X" or "O")
    field[2][1] = (field[2][1] == "O" and "X" or "O")
    field[2][2] = (field[2][2] == "O" and "X" or "O")
    field[2][3] = (field[2][3] == "O" and "X" or "O")
    field[3][2] = (field[3][2] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 5 then
    field[2][2] = (field[2][2] == "O" and "X" or "O")
    field[3][1] = (field[3][1] == "O" and "X" or "O")
    field[3][2] = (field[3][2] == "O" and "X" or "O")
    field[3][3] = (field[3][3] == "O" and "X" or "O")
    clicks = clicks+1
   end
  elseif x == 6 then
   if y == 3 then
    field[1][2] = (field[1][2] == "O" and "X" or "O")
    field[1][3] = (field[1][2] == "O" and "X" or "O")
    field[2][3] = (field[2][3] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 4 then
    field[1][3] = (field[1][3] == "O" and "X" or "O")
    field[2][2] = (field[2][2] == "O" and "X" or "O")
    field[2][3] = (field[2][3] == "O" and "X" or "O")
    field[3][3] = (field[3][3] == "O" and "X" or "O")
    clicks = clicks+1

   elseif y == 5 then
    field[2][3] = (field[2][3] == "O" and "X" or "O")
    field[3][2] = (field[3][2] == "O" and "X" or "O")
    field[3][3] = (field[3][3] == "O" and "X" or "O")
    clicks = clicks+1
   end
  end
 end
end

function mainLoop()
while running do
 e = {os.pullEvent()}
 update(e)
 if check() == true then
  slc = 2
 end
 draw()
end
end

generate()
draw()
mainLoop()
clear()