General:
On each screen you advance to another screen by interacting with a "warp". These sometimes bring you to another screen, some time another location on the same screen. It is not known how many warps are on each screen. However, the memory locations for each warp have been found (For the memory locations of where a warp will send you check the memory guide.).
There seem to be 14 bytes of memory that each hold a value of where a warp will send you. Each screen seems to modify the the bytes as an array. The first byte being the 0th member. This would make the array of size 23. The value in a byte is 1 less than the value of the screen given in the CMS editor. e.g. The 17th screen is warped to by the value 16. Also, if you're using the memory editor in Snes9x, set it to Hex to more easily tell which screen you will be sent to. As the CMS screen uses Hex values.
Old West:
The 17th screen(the screen just before Yosemite Sam) sets all the bytes to 17th screen. When you interact with each door it sends you to another position on the same screen. The data for where is sends you on the screen has yet to be found. It's quite possibly another array.
Atlantis:
On the screen "26" in the CMS editor, if you ride the bubble normally used to clip through some walls and skip the majority of the screen, you can ride this bubble up through the top of the level. After releasing the "x" button above the screen Porky zips up (somewhere around yPosition 63200). At this height there is code representing the level you were not meant to reach. In three places there are warp blocks. Due to screen 17 messing with all the values, you can not use these warp blocks in a normal play through.
Abusing the demos:
If you wait for a demo to play at the start of the game it will set the values in memory for the screen it plays. e.g. you can wait for the demo to play The Alps and the memory locations for that screen in The Alps will be played. If a warp that uses those memory locations could be found early in the game then you could warp to The Alps.
