Over the Dirt would be nice as slow lines are rarely seen in officials.

Happiness Valley allows new players to see what a really good level looks like in terms of BG Lines.

And then there are other levels with new concepts, the ones which have the best IMO should be officialised.

  A couple of these levels would be nice but Bounce Boards and TTT Labs and the like are too hard, it's a shame because some of them were really good.

  Another world is an overall great level, no real new challenges but it is good and it has a nice lay out

  Sea tides is great, but there's a few levels like it already and is not very good on the racing department, which is why I'm a bit hesitant.

  Sea tides is for me the absolute winner to be honest

  It would probably also be a good idea to check out some of Nachos' and Sephirya's levels. I could not find any of their levels in my pack. I especially like this level: Bounce Flyer.

  That pack is extremely helpful indeed!

  Chaotic Rift is rather good, but I don't know if it being an auto affects its chances of being official negatively.

Extreme Winter is another great level.

And not to mention Static Skybase.

There are many other great levels in this pack: The Best of the Best.

  execution is just outdated gis tonto :)

  Nice choices of levels, I'm especially intrigued by Cobblestone and Corner's Challenge.

  Fantasy Valley
Cobblestone
Corners Challenge
Happiness Valley!

These are my suggestions just off the top of my head

  ooh, deathrunner isle is a though one. The concept is great but the execution is pretty bad IMO.

  Deathrunner Isle

  I would consider these:
- High Jumps Journey
- Bounce boards

More levels may follow.

  Interesting pack :P

  I made this pack out of the official or not topics, so all levels in this are older than 5 years.
If you know of worthy newer levels, do tell.

If I ever make TTT labs official I will modify the level to make the springs work infinitely. But I severely doubt that as Boing! used a similar concept but pulled it of in a way more fun way.

Note, just because a level is in this pack does not guaranty it to be official.