function love.load()
    sequence = {}

    function addToSequence()
        table.insert(sequence, love.math.random(4))
    end

    addToSequence()

    current = 1

    love.graphics.setNewFont(20)
end

function love.keypressed(key)
    if tonumber(key) == sequence[current] then
        current = current + 1
        if current > #sequence then
            current = 1
            addToSequence()
        end
    else
        love.load()
    end
end

function love.draw()
    local function drawSquare(number, color)
        local squareSize = 50
        love.graphics.setColor(color)
        love.graphics.rectangle('fill', squareSize * (number - 1), 0, squareSize, squareSize)
        love.graphics.setColor(1, 1, 1)
        love.graphics.print(number, squareSize * (number - 1) + 19, 14)
    end

    drawSquare(1, {.2, 0, 0})
    drawSquare(2, {0, .2, 0})
    drawSquare(3, {0, 0, .2})
    drawSquare(4, {.2, .2, 0})

    love.graphics.print(current..'/'..#sequence, 20, 60)
    love.graphics.print('sequence[current]: '..sequence[current], 20, 100)
    love.graphics.print(table.concat(sequence, ', '), 20, 140)
end