2D Tile based procedurally generated maze

So I'm quite the beginning unity coder, and for my mid year project I wanted to make an 8 bit tile based maze game, with riddles and hidden codes. I have everything set but the maze and the riddles, since they are dependent on the maze in which I have a problem. I want to make an 8 bit procedurally generated tile maze, but I have several issues.
A) Every maze generating code I found creates a maze with a beginning and an end, but what I want is a maze that has "chambers" which contain the riddles (thats why i havent been able to create them yet).
B) I need the character to start in a chamber in the center rather than the side of the maze, and I need all chmbers to be available via the maze.

Would really appreciate the help!
Thanks in advance!

 

First make the maze by hand once, making it exactly the way your game needs it: chambers, riddles, etc.

Once you have that first hand-made maze fully operational and the way you want it, then come back and post a brief discussion of what the maze looks like and perhaps someone here can offer guidance to making code that generates it.