Is there any kind of program….

where you can design….. big 3D levels like in game. I don’t know why i have this sudden urge to mess around with something like this… i just did >___>.. LOL
Answer #1
Well, a lot of games come with extras to make user levels (even Doom 1 and 2 have had people write level makers for them).
Or you could try Bryce
http://www.google.com?t=1637423&highlight=
A full proper 3D scene maker, not just game levels (but it can make them too, just a little more work).
Answer #2
go for “moddb” they need some people like you. they even make different mods for different games you’ll have a vast choice also to select from