User blog comment:Deathstalker666/Vorknkx's Level Resources/@comment-1496755-20170103003016/@comment-3547390-20170103004310

If you have seen my full WAD playlist, you will know how impossible it is to be strictly chronological. The entire series is all over the place in terms of when levels were made, it definitely gets interesting to see how chaotic it is to try to cover this. But there is no chronological list on the internet, so really I am just playing and organizing afterwards, so the playlist serves as a nice way to say the order they actually were released while the Episode number is the order I played them in.

Let us see. WAST are levels 18, 40, 14, 73 (date is not clear), 47, 43, and 36. This means most are generally around the 30 to 40 range, but there are some weird levels made a bit earlier and AMBUSH has no clear date, but is most likely made at some point prior to 73.

SIMPLE are levels 72, 69, 84, 41, 16, and 5. While there is no neat range, we can see that it features quite a few levels made later than those in WAST with only the later levels of the Episode being made earlier.

E1On currently only is 81. This means that it could be made around the same time as WAST, but might be an earlier level in a pack that otherwise shows levels that are newer. LITTLE is 66, meaning it is a bit older, but may once again be an exception and not the rule.