Das Amulett version 2.0, a German text adventure by Martin Oehm. Written 1996 in Turbo Pascal 5.0 as the author's first attempt to write a German text adventure with a decent parser, so the game is rather easy. MS-DOS executable.
Anal frustriert version 1.0 by Robin Haberkorn, a German text adventure. You managed to lock yourself into your toilet and must find your way out. Not for children under 30! :) The .exe file is a Windows installer, but the result is an MS-DOS executable. Walkthrough included.
Im Bannkreis, Ein interaktiver Ausreissversuch. A German text adventure with Enchanter-like magic by Martin Oehm; version 20dec2000. Archive includes game and MS-DOS interpreter. [file is linked from games/tag/bann_tam.zip]
Humor ist, wenn man trotzdem lacht. A German hybrid of a text and a point-and-click adventure, based on Terry Pratchett's Discworld novels. Written by Raphael Kirschke, using Raphael's own adventure authoring system.
Hermetisch verschlossen v1.1.1, a German mystery by Uwe Pilz. ALAN game files and MS-DOS executable. ALAN source code available on request from the author. [file is linked from games/alan/german/hermet.zip]
Unter Hirschen, version 1.0, written in German by Florian Edlbauer. A visit to a Munich beer garden. (a machine independent TAG game file is in games/tag/hirsch.zip)
Hortulus v1.0, a German text adventure by Florian Edlbauer. Archive includes game and MS-DOS interpreter. [file is linked from games/tag/Hortulus.zip]
Die Karawane der siebten Dynastie, an illustrated German text adventure by Extase. Playable demo (world 1 of 5) of a shareware game.
Das Stundenglas, a German text/graphics adventure released commercially in 1990 by Weltenschmiede/Software 2000, and made freely available in October 1998 by its author, Harald Evers.
Terra Incognita, version 1.0. A text adventure in German by Rolf Lautenbach. MS-DOS executable.
Der Wolf und das Maedchen, version 1.0. A German text adventure by Rolf Lautenbach. Windows executable.
Pacy-Face und seine Abenteuer in Zauberland. A simple German text adventure by Philipp Koehn. QBasic source code, ported from C64 BASIC by Bob Newell. [file is linked to games/source/basic/german/zauber.zip] (the C64 original is in games/c64/german/zauberland)
Die Zeitreise, a German interactive story by PIVOT. MS-DOS executable. Source code is available from the primary author, Bernd Roehling.