If you have managed to stick yourself in a game without knowing how to move it further, you very probably will attempt to find a walkthrough to solve your problem. However the difficulty is that once you have succeeded in getting one it may happen that it won't fulfill your expectations and you won't find what you were searching for. The destiny of all walkthroughs and manuals is that they never are as much detailed as we'd request and also that words sometimes are, simply said, not enough.
I choose this foreword intentionally because with the introduction of the RZX format into the ZX Spectrum gaming is possible to forget the walkthroughs. You simply won't need them anymore! The RZX format serves to catch a playing of a game. It though is some sort of video format devised specially for the ZX Spectrum that can be used to store a complete solution/walkthrough of any game. You then can play this video as if you would play a movie.
Above I mentioned that RZX is a new format. Well, I wasn't absolutely right as its first version appeared already back in 2002, nevertheless no sooner than half a year later first gaming guidelines started to emerge. In this context I recommend you to visit the RZX Archive which is recognized to be the most comprehensive overview of RZX videos. For completeness sake let me add that this new video standard's creators and specifiers is the Ramsoft company. Full specification of this standard you can find here.
Well, having a completely new format is surely a nice thing, however it is worthless having no software capable to work with it. Fortunately, you don't need anything so special to create and play RZX videos - all you need is a common emulator with RZX video support. Currently, several emulators do support the RZX format - Fuse (Unix), Spectaculator, Spin, and SpecEmu. You can download any of them from here.