Doom the Way id Did: The Lost Episodes (DTWID-LE.WAD)

Doom the Way id Did generated a ton of buzz in the community, who turned out to craft approximately 100 submissions. The only event that I know to have surpassed it - as far as single-player levels go - is the 10 Sectors contest. It has also enjoyed a number of spinoffs during its lifespan, including the long-lived but recently finalized Ultimate DTWiD. It's crazy to think that a handful of levels went on to form the foundation of No End In Sight, something like an 850% increase in volume. All of Callum Guy Oliver's entries were gathered together in their own package, PhobosDeimos Anomaly, in a posthumous tribute. A few even saw solo releases. The lion's share of the "rejects" were published as a gargantuan collection dubbed The Lost Episodes. DTWID-LE saw a beta release in 2012 but thereafter entered a drawn-out polishing phase where a few new maps were made or substantially changed. It didn't see its first iteration on /idgames until 2016.

Interception (INTERCEP.WAD)

Interception started around the height of vanilla megaWAD madness, back in 2011. Matt534Dog wanted to make a megaWAD, and there was enough enthusiasm knocking about that everyone not working on their top secret projects said "Hell yeah!" and started pouring in the maps. Then on release, the Doomworld MegaWAD Club played it, undergoing a sort of playtesting by fire, after which the PWAD underwent some significant changes. The super double ultimate final release happened sometime in 2013, but there are still a few game-breaking bugs to stamp out. Funny, unless you're playing it and run across them, trying to find out whether you just don't have the solution or whether the puzzle itself is inherently broken.