\documentclass[12pt]{scrreprt}

\usepackage[latin1]{inputenc}
\usepackage{ngerman}

\newcommand{\bottles}{1000}
\newcommand{\hours}{24}

\begin{document}
\chapter{Fehlerfindung}
\section{Level 1}
Es ist oft gar nicht so leicht Fehler in \LaTeX\ zu finden.
Aber zum Glück bekommt ihr ja diese wunderschöne Übung, um das zu lernen.
\section{Level 2}
Wenn ihr alle Fehler bis hierher schon mal gelöst habt,
dann habt ihr wirklich gut im Theorieteil aufgepasst. 
Könnt ihr dann auch eines dieser Probleme lösen?

\begin{enumerate}
 \item The Emperor
 \item You are the ruler of a medieval empire and you are about to have a
celebration tomorrow. The celebration is the most important party
you have ever hosted. You've got \bottles\ bottles of wine you
were planning to open for the celebration, but you find out that
one of them is poisoned.
 \item The poison exhibits no symptoms until death. Death occurs within
ten to twenty hours after consuming even the minutest amount of
poison.
 \item You have thousands of prisoners at your disposal and just under 24
hours to determine which single bottle is poisoned.
 \item What is the smallest number of prisoners you must have to drink
from the bottles to be absolutely sure to find the poisoned bottle
within \hours\ hours?
\end{enumerate}

\section{Level 3} Jetzt wirds \textbf{wirklich} schwierig!

\section{Level 4}
\begin{center}
\begin{tabular}{|c|cccc|}
\hline
Vs & Linux & Windows & Mac OS X & Solaris\\
\hline
Linux & \  & \ & \  & \ \\
Windows & \  & \ & \  & \ \\
Mac OS X & \  & \ & \  & \ \\
Solaris & \  & \  & \  & \ \\
\hline
\end{tabular}
\end{center}
\end{document}