Sorry for the wait, but mediafire kept failing my upload, so I had to download Dropbox and set it up, then upload it.
Click here to download it
Each level is 50 metres above or below each other. So, when editing, to get to level 2 from level 1 move the camera up 50 metres, to get back from level 2 to level 1 move it down 50 metres. They are stacked with level 1 at the bottom, level 2 in the middle and level 3 at the top.
When playing, to switch levels use the world methods I added. They automatically move the camera and such for you.
Just to test level switching, I made the F1 key load level 1, F2 load level 2 and F3 load level 3. You can delete these and add in proper level switching into your code, so at the end of level 1 it starts level 2 and the same for 2 to 3.
There is more to be done at your end, so please don't think it doesn't work, or that is it.
█░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░█
█░░▓░░░░░░░▓░░░░░░░░░░░▓▓░░▓░░░░░░▓░░░▓░░░░█
█░▓░▓░▓▓▓░▓▓▓░▓░▓░░░░░░▓▒▒░░▒░░▓▓░▓▓▓░▓▒░░░█
█░▓▓▓▒▓▒▒▒░▓▒▒▓▓▓▒▓▓▓░▓▓▓░░▓░░░▓▒▒▓▒▓▒▓▒░░░█
█░▓▒▓▒▓▒░░░▓▓░░▒▓▒░▒▒▒░▓▒▒░▓▓░▓▓▒░▓▒▓▒▓▒░░░█
█░▓▒▓▒░▒░░░░▒▒▓▓▓▒░░░░▓▓▒░░░▒▒░▒▒░░▒░▒▓▓▓░░█
█░░▒░▒░░░░░░░░░▒▒▒░░░░░▒▒░░░░░░░░░░░░░░▒▒▒░█
█░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░█
I have mostly moved on from Alice, but may still respond to messages if important [¬º-°]¬