ComputerCraft TicTacToe game (randomized starts)

--Basic TicTacToe Game
--Local Multiplayer (=there is no AI)
--Written completely by Piorjade


--Variablen
_ver = 0.1
_verstr = "0.1"
mainmenu = false
num = math.random(2)
if num == 1 then turn = "O" elseif num == 2 then turn = "X" end
slot1 = ""
slot2 = ""
slot3 = ""
slot4 = ""
slot5 = ""
slot6 = ""
slot7 = ""
slot8 = ""
slot9 = ""

--Funktionen
function clear()
    term.setCursorPos(1,1)
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.clear()
end

function drawMenu()
    clear()
    term.setBackgroundColor(colors.lime)
    term.setCursorPos(24,6)
    term.write("Start")
    term.setCursorPos(24,8)
    term.write("Exit")
    mainmenu = true
    while mainmenu do
        local event, button, x, y = os.pullEventRaw("mouse_click")
        if button == 1 and x >= 24 and x <= 28 and y == 6 then
            drawTable()
        elseif button == 1 and x >= 24 and x <= 27 and y == 8 then
            clear()
            print("Thanks for playing!")
            break
        end
    end
end

function drawTable()
    clear()
    print(" | | ")
    print("-+-+-")
    print(" | | ")
    print("-+-+-")
    print(" | | ")
    playing = true
    game()
end

function finish()
term.setCursorPos(1,9)
term.write(turn.." won!")
sleep(2)
clear()
print("Thanks for playing!")
playing = false
sleep(2)
os.reboot()
end

function game()
    while playing do
        term.setCursorPos(1,7)
        term.write("It is "..turn.."'s turn.")
        local event, button, x, y = os.pullEventRaw("mouse_click")
        if button == 1 and x == 1 and y == 1 and slot1 == "" then
            slot1 = turn
            term.setCursorPos(1,1)
            term.write(turn)
            if slot1 == turn and slot2 == turn and slot3 == turn or slot1 == turn and slot4 == turn and slot7 == turn or slot1 == turn and slot5 == turn and slot9 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 3 and y == 1 and slot2 == "" then
            slot2 = turn
            term.setCursorPos(3,1)
            term.write(turn)
            if slot2 == turn and slot1 == turn and slot3 == turn or slot2 == turn and slot5 == turn and slot8 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 5 and y == 1 and slot3 == "" then
            slot3 = turn
            term.setCursorPos(5,1)
            term.write(turn)
            if slot1 == turn and slot2 == turn and slot3 == turn or slot3 == turn and slot5 == turn and slot7 == turn or slot3 == turn and slot6 == turn and slot9 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 1 and y == 3 and slot4 == "" then
            slot4 = turn
            term.setCursorPos(1,3)
            term.write(turn)
            if slot4 == turn and slot1 == turn and slot7 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 3 and y == 3 and slot5 == "" then
            slot5 = turn
            term.setCursorPos(3,3)
            term.write(turn)
            if slot1 == turn and slot5 == turn and slot9 == turn or slot3 == turn and slot5 == turn and slot7 == turn or slot4 == turn and slot5 == turn and slot6 == turn or slot2 == turn and slot5 == turn and slot8 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 5 and y == 3 and slot6 == "" then
            slot6 = turn
            term.setCursorPos(5,3)
            term.write(turn)
            if slot3 == turn and slot6 == turn and slot9 == turn or slot4 == turn and slot5 == turn and slot6 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 1 and y == 5 and slot7 == "" then
            slot7 = turn
            term.setCursorPos(1,5)
            term.write(turn)
            if slot1 == turn and slot4 == turn and slot7 == turn or slot3 == turn and slot5 == turn and slot7 == turn or slot7 == turn and slot8 == turn and slot9 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 3 and y == 5 and slot8 == "" then
            slot8 = turn
            term.setCursorPos(3,5)
            term.write(turn)
            if slot7 == turn and slot8 == turn and slot9 == turn or slot2 == turn and slot5 == turn and slot8 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        elseif button == 1 and x == 5 and y == 5 and slot9 == "" then
            slot9 = turn
            term.setCursorPos(5,5)
            term.write(turn)
            if slot7 == turn and slot8 == turn and slot9 == turn or slot3 == turn and slot6 == turn and slot9 == turn or slot1 == turn and slot5 == turn and slot9 == turn then
                finish()
                break
            else
                if turn == "X" then
                    turn = "O"
                else
                    turn = "X"
                end
            end
        end
    end
end

--Code
clear()
drawMenu()