Combine multiple vids into one

[Blaze]

lets say in theory I have four parts to a vid (intro, part 1, part 2 and credits) and I had them all saved as separate .mkv's based on Daffys x264 tutorial, how would I go about combining those into one seamless video?

[Max_]

Try to use MkvToolNix GUI, also named in daffy's tutorial
There is a programm (that comes with it I think) that's named mkvmerge GUI. Try it with that
should work