Can we make lvl/tileset suggestions if even we don't need to make the actual lvls/tilesets? Plz? I got loads of ideas, most of them that are probably possible to do, but I don't have the skills to use them in my own lvls.
1. Make airboard/helicopter ear lvls! The player will go through the whole lvl with the ability to fly all over the place. This is a good lvl to use the rocket turtle in, not as a boss, but as a trap/enemy. The rocket turtles will fly past you once you hit Activate Boss and you are flown forwards in a wind tunnel, unable to go backwards, so you much use your reflexes and skills to avoid the rocket turtles. The turtles, after they have used up all their Area IDs, will fly safely into a wall once you exit the wind tunnel. Make this tunnel reaaaaaaaaaaly long and for even more difficulty, add flying lizards that will follow you and that you will have to kill (if you're still alive) when you exit the tunnel.
2. More mazes. You don't like putting arrow signs in your lvls, Fawriel?

Don't worry! No arrow signs are needed in mazes!

I'll leave you to work out what kind of maze suits the lvl best but make sure that you make it long and place lots of traps/enemies in it. Also make sure that all the walls are touching each other so the player can use the hug-the-wall technique (that's when you only follow the left or right wall to get out of a maze) to exit the maze, or ppl will get stuck in there forever like in Tomb Rabbit...
3. Use bosses as traps. You know the weapon SCEs? They fire seekers/toaster, etc. but those bullets they fire can't hurt you. Well, how about placing bosses in different parts of the lvl (they must be inaccesible and protected from your attacks) and put Activate Boss events at the very start of the lvl. The Swiss turtle guard (I forgot his real name) and the Bilsy boss can both shoot at you and their bullets will go through walls. Use them as traps! The robot with a swinging metal whip-thingy that fires missiles could also be used, although the whip is hard to avoid on Hard difficulty.
4. Bonus lvls, with bonus tilesets that are not used anywhere else in the lvl pack! These unique lvls should be easy to play (therefore giving the player some rest and lots of fun) and should have loads of crazy stuff that you wouldn't normally put in sp-levels. Make tests or pinball games (although they will have to be very original) or turtle shell rain, shield-bonanza, sugar rush lvls (100 fruits + 1000000 baddies = splat splat splat), etc.
5. You may be against this, Fawriel, I don't know. Use other ppl's tilesets. So far few good SP lvls have been made using the Cyberspaz tilesets and 7th Lava Fall. These are just suggestions. The lvl pack may or may not take place in industrial areas, deep space or city sewers.