3x3 Turtle Test

--Local Variables

local blocksMined = 0
local fuelLevel = 0

--Move Functions

function turn180()
    turtle.turnRight()
    turtle.turnRight()
end

--Check Functions

function checkFwd()
    while turtle.detect() == true do
        digFwd()
    end
end

function checkUp()
    while turtle.detectUp() == true do
        digUp()
    end
end

--1x3 Mine

function mine1x3()
    checkFwd()
    turtle.forward()
    turtle.digUp()
    checkUp()
    turtle.digDown()
    checkFuel()
end

--3x3 Mine

function mine3x3()
    mine1x3()
    turtle.turnLeft()
    mine1x3()
    turn180()
    turtle.forward()
    turtle.forward()
    mine1x3()

    --Reset
    turtle.back()
    turtle.right()

    --Count blocksMined
    blocksMined = blocksMined + 1
end

--Check Fuel Level

function checkFuel()
    fuelLevel = turtle.getFuelLevel()
    if turtle.getFuelLevel() == 0 then
        turtle.refuel()
    end
    return fuelLevel
end

function returnStart()
    for i=0, blocksMined do
        turtle.back()
    end
end

--Start Main Function

function main()
    checkFuel()
    for i=0, 25 do
         mine3x3()
    end
end

main()