Super Mario Land 2: 6 Golden Coins/Wario's Castle

This is it. You've finally gathered the 6 golden coins and have unlocked the door to the castle. Inside is a sadistic level with fiendishly clever traps, precarious platforming sections and a strong boss at the end. It is one of the longest levels in the game, and it lacks a checkpoint, meaning that if you lose a life, you must start over completely. The castle's multiple floors of danger is your only remaining obstacle. Defeat Wario and reclaim what is rightfully yours!

Wario's Castle
This level is split into three floors that contain their own deadly features. The first floor is shorter than the rest, but contains more obstacles. You need to maneuver around a combination of swinging spiked balls and statues of pirahna plants that spew fire at you. If that isn't bad enough, there are also lava pits that instantly kill you on contact. Even if you do make it to the transition staircase, you still have to deal with one more flamethrowing pirahna plant, one that can cause a cheap death if you aren't careful.

The second floor starts off with a platforming section with tiny moving platforms and a floor of lava below. Not only do you have to make precise jumps on to these small platforms, you also have to crouch at the right time to avoid getting pushed off by low ceilings. Once you pass that section, you will arrive in a room with a clever trap. While it seems like there's nothing, touching the center of the three floor tiles will trigger a giant fist that rapidly slams into the ground, blocking your path. It is very difficult to evade, so you need to avoid setting off the trap by jumping over the center tile. You will need to do the same in the next two rooms. After that is a section of crumbling platforms over a lava pit. Jump quickly and precisely to avoid falling into the pit and having to restart the level again. Scale the transition staircase and prepare for the last floor.

The first section of this level is also about platforming over a lava pit, except you will also have to contend with the spikes above and the raising platforms. Thankfully, these platforms are longer than others, meaning that you can focus more on controlling the height of your jumps rather than on the length. After that is a section of spiked columns. These columns will lower and rise back up when you approach them. You should wait for them to rise back up and run underneath to avoid any risk of getting hit. Past the pipe is your final challenge before Wario, a series of rooms with Don Gabamen. These spheres with the face of Wario will bounce around the room, is immune to fireballs and require two hits to be defeated. The first room contains only one Don Gabamen, a manageable amount, but the two other rooms contain two Don Gabamen, which can make avoiding both very difficult. If you made your way through all three rooms, you have conquered every challenge the castle possesses. In this final room containing a single block that gives you a power-up, take a breather and prepare yourself for the final boss of the game.

Boss: Wario
Being a counterpart of Mario, Wario has all the jumping prowess Mario has, but his massive girth let him generate shockwaves when landing. He will start off by jumping around trying to land on you, and canstun you if you're on the ground when he lands. He can also drop lamps on you with the shockwave. Wario is immune to fireballs and requires three stomps on the head to be defeated. However, he's not giving up so quickly, and runs to the next room. You must go after him, but be sure to grab the carrot power-up before you do.

Wario has another trick up his sleeve, a carrot of his own! He will gain the same fluttering abilities as you have, and he will use it to stay in the air longer before dropping down. The strategy is generally the same here, only that Wario can stay in the air longer before falling to the ground. Three stomps will make him flee again. Don't get the Super Mushroom if you're still Rabbit Mario or Fire Mario, as it will actually downgrade you.

Cornered and desperate, Wario uses his final power-up, a fire flower, and can now shoot fireballs at you. He will no longer try to crush you or cause lights to fall off, so you can concentrate on evading his fireballs. Another three hits and you've beaten Wario, as well as the game!

The End!
With Wario defeated, the castle's ownership is returned to Mario, and reverts to its original state. Wario has managed to escape, but it is clear that he won't attempt to try any castle hijacking in the future. Enjoy the credits!