\documentclass{standalone}

\usepackage{tikz}
\usepackage{shapes}

\begin{document}
\begin{tikzpicture}
  \grid{14}{10}{(-9,-1)}

  \staircaseV{blue}{(0,0)}
  \staircaseV{green}{(-5,2)}

  \square{gray}{(-2,4)}
  \square{gray}{(-1,1)}
  \square{gray}{(-1,3)}
  \square{gray}{(-1,4)}

\end{tikzpicture}
\end{document}

