Kirby's Dream Land 2/Dark Castle

Section 1
Collapsing bridges cross over the huge gap towards Dedede's castle. Don't stay in one spot for too long, or you could find yourself plummeting into the abyss. Fortunately, the enemies in this area aren't very threatening, so you shouldn't have too much trouble making your way to the end. There's even a Health Drink halfway through the level if you do take any damage.

Section 2
While this section might look like a vertical climb, the screen automatically scrolls horizontally instead. As soon as you enter the section, quickly jump up the platforms to reach the top, then stay alert as the screen continues to scroll down a straight hallway. Running Waddle Dees as well as well-placed Bouncy Tys will attack you from the front and behind. Evading them is very difficult due to the screen scroll, so you can take a bit of damage if you're not dexterous enough. Go through the door when you see it before the screen scrolls too far right.

Section 3 - Mid-Boss: Efreeti
Efreeti is the first of seven mid-bosses that you will have to face on your way to King Dedede. There are no gimmicks here, so just defeat it like you've did countless times before to clear the stage.

Section 1
This stage begins with an underwater section. While the level layout is fairly straightforward, this section is filled with Glunks that can fill the water with their projectiles. Swim carefully and try to defeat them one at a time. Don't be too hasty once you surface, as there are icicles dropping from the ceiling on the hallway to the door.

Section 2
This is a rest area with every copy ability-granting enemy safely contained. Choose the ability you're the most comfortable with and move on further into the stage.

Section 3
This section has two halves, with Section 4 connecting the two together. The first half has you hopping over spiked floors, which is quite simple to do if you're just Kirby or is with Coo, but challenging otherwise. At the end, go through the top door to progress. Once you've made it to the right half of the section, be sure to go through the bottom right door for some nice rewards. Continue down the hallway, where icicles will fall from the ceiling and sections of the floor can collapse. Be fast and careful at the same time in order to make it to the end unscathed.

Section 4
There are three parts of section 4 that you can reach. The lower-left chamber, reached by the corresponding door in Section 3, is empty, while the lower-right chamber contains three 1-Ups. The top part contains a trapped Animal Friend, guarded by a simple Blade. You can actually reenter this room and defeat Blaze over and over again until you get the Animal Friend you want.

Section 5 - Mid-Boss: Master Green
Master Green is the second mid-boss that you must fight on the way to King Dedede. Like Efreeti, the fight with this oversized jellyfish takes place in a simple room. You should be quite experienced with it from multiple encounters from before, so you should have no trouble defeating it.