You're not 1337 in QoB until you get the duke nukem level

Anyways, first level is uhhh, the ending is fake, you actually end the level at a supposed 'bonus stage'.

I haven't played t in ages, but I'll give you a small idea on how to finish it.

1) Open up the cave of the crystal by a scenery trigger event somewhere in the top-right of the level.

2) Spend hours in the mine maze at the top-left and finally buttstomp the blue crystal.

3) Go back somewhere towards the bottom-left and buttstomp a crate in a small room after going through the passages up north (the ones where you keep teleporting back to the start, but keep on trying you'll get into a room eventually)

4) Go to the bottom-right of the level, you can now pass without dying and you'll end up being in coloury caves.

5) Go through the coloury caves, at the end you'll get to a point with a lot of tunnels, choose the right one each time or die (takes a while, I can't remember the cobination).

6) You'll go through a passage with a few TNT ammo, DON'T EVER USE THIS AMMO, not even ONE! You need it at the ending credits to access the secret duke nukem level...

7) You're now inside a huge fat invisible maze, spend 2 years of your life trying to figure out what it's like and break two crates inside it.
TIP: You're never actually stuck even though it seems like it, just keep trying to jump up at different places and you'll get un-stuck eventually

8) Once you break the two crates go through a large tunnel passage of sucker tubes that lead outside of the invisible maze (by doing step 7 you should've found it already)

9) You finished the level, cheer, next level is easy, the one after that is just a large kill-fest, nothing that really needs a walk-through...

Don't kill me if somehting is wrong, I haven't played QoB in years