i need help creating a special cow level

[kiugetski]

here is what i would like to do
a special cow level that would have like 10 levels
so when we create the cow level i would want it to have a trap door that get us to the next cow level and so on

could anyone help me do that ???

[Necrolis]

You either need to replace existing levels or use one of the extlevels plugins to do this, additionally this will then require levels with a fixed ds1 (either the entire level or a fixed part of the level) for you to put the trap door on.
You can use this tutorial for trap doors, but beware it doesn't work on all versions; and will likely need some code edits to work correctly in 1.13+.