LaTeX.org

Hi there, I have the following code and I want to lengthen the arrow so that it stretches to the left most box in the grid. Can someone please helP!

\begin{picture}(75,75)(0,0)
\multiput(0,0)(0,25){2}{\line(1,0){250}}
\multiput(0,0)(25,0){11}{\line(0,1){25}}
\put(180,30){
\xymatrix{\ar@/^1.5pc ...