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Review
As a game, Mariel is a competent and polished, but by no means remarkable. This short story haves you wake up in an unknown hospital after a traffic accident; you're first task is to escape from what is functionally (if not literally) a locked room. The rest of the game is a little more inventive, including a nice variation on one of the most famous scenes of Anchorhead, but there is nothing that will blow you away either in terms of puzzles or of story.
Mariel is in fact more interesting as the example game that accompanies GerX, the German library extension for Inform 7. You can look at the source code and see how the weird combination of English code and German prose works, and how technical details of the German language are managed. It seems to be relatively elegant, actually. There is also a 50-page PDF file which acts like an Introduction to Inform 7 in German that uses Mariel as the running example.
