How do I make 2D level wads?

[Owner]

I can only make 3D wads, but i want to make 2D ones please help. :(

 

[RE4FAN]

SA2 or Sonic CD

ask the person who made the mario_level.wad he can help cause thats 2D

 

[Prime 2.0]

...It's in the map header. Just look at the tutorial for making map headers.
Tutorial

 

[Rob]

Or are you asking for object placement help? Place them all along the same horizontal plane.

 

[Monsteriestyn]

You could also open up a 2D level and try to check out how it works. Just remember that even though it's 2D, you're looking at the level from the top perspective. That's what most people don't realize, and have trouble doing.