How to write a world for WissenSchaf(f)t?

This tutorial will show you how to write a simple world for WissenSchaf(f)t? (the demo world distributed with it). You should already be familiar with the Java programming language and programming in general (as that will not be explained).

We will implement a four-mapped world step-by-step. We want these maps:

The user needs to enter his/her name.
A funny slide upon the ground.
Step counting: A door which opens just every second step, and a guard which asks the user about prime numbers.
A finish map where the user finds a sign to congratulate him/her.

The images needed for this world can either be created by you when needed, or you can download and pre-install them at this time; just unpack the archive into the root directory of this world (./Welten/Demo/ relative to the WissenSchaf(f)t? root, for example).

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