\documentclass{standalone}
\usepackage[paperwidth=\maxdimen,paperheight=\maxdimen]{geometry}
\usepackage{pgf,tikz}
\begin{document}

\begin{tikzpicture}[x=24pt, y=24pt, draw=white, double=black, line width=2.1pt]
	\node (1) at (0, 0) {$1$};
	\node (3) at (3, 0) {$3$};
	\node (4) at (11, 0) {$4$};
	\node (2) at (14, 0) {$2$};

	\draw[double=white,draw=blue] (2) -- (14, -8) -- (1, -8) -- (1, 6) -- (12, 6) -- (12, -4) -- (3, -4) -- (3);
	\draw[double=white,draw=red] (4) -- (11, 4) -- (2, 4) -- (2, -6) -- (13, -6) -- (13, 8) -- (0, 8) -- (1);
	\draw[double=blue] (3) -- (3, 11) -- (21, 11) -- (21, -10) -- (5, -10) -- (5, 9) -- (19, 9) -- (19, -7) -- (7, -7) -- (7, 5) -- (17, 5) -- (17, -3) -- (9, -3) -- (9, 2) -- (15, 2) -- (15, -1) -- (11, -1) -- (4);
	\draw[double=red] (1) -- (0, -1) -- (4, -1) -- (4, 10) -- (20, 10) -- (20, -9) -- (6, -9) -- (6, 7) -- (18, 7) -- (18, -5) -- (8, -5) -- (8, 3) -- (16, 3) -- (16, -2) -- (10, -2) -- (10, 1) -- (14, 1) -- (2);
\end{tikzpicture}
\end{document}