\documentclass{standalone}

\usepackage{tikz}
\usepackage{shapes}

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

  \staircaseV{blue}{(0,0)}

  \square{lightgray}{(-4,4)}
  \square{lightgray}{(-3,3)}
  \square{lightgray}{(-3,4)}
  \square{lightgray}{(-2,2)}
  \square{lightgray}{(-2,4)}

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

\end{tikzpicture}
\end{document}