After making a large map with slopes, scripts, all new resources and whatnot, I felt like making something very basic.
Also used this opportunity to get some maps that were gathering dust finished and released; a very old episode 2 project (although I have released e2m1 of that project before as e2m1er.wad), and a project for EDGE that got to 1˝ levels (Rust). The maps were converted to use vanilla resources only (except for the sky).
E2M5-E2M9 however are brand new levels for this release. The wad is tested to be vanilla compatible, though during mapping it has mainly been tested with ZDoom for convenience's sake. Also found to work with Eternity. But as it is vanilla compatible, any port should work.
Lüt for (lots of) playtesting and bugging to finish it, and CodeImp for the marvellous Doom Builder. And Esselfortium for (not) playtesting it.
New from scratch, except E2M1 is modified E2M1ER.wad.
About a year.
Doom Builder, XWE, ZDBSP
E2M5-E2m7 have too many things for game saving with doom.exe.