Adventure Island/World 6

Stage 1

 * 1) Right from the start, you have a difficult jump that will send you to an island with an egg on it.  However, this egg contains an eggplant, so you definitely don't want it to crack open.  Instead, jump a second time as soon as you set foot on the island to hop over the egg.  The rest of the stage is the usual variety of Octopi jumping among clouds, with a few Sneils occupying the islands in between.
 * 2) The next section is a more intense version of the previous section.  You have two choices: to take it slow and steady, or to speed through it.  If you have a weapon, you can proceed slowly and pick the Octopi off.  However, don't go too slow, or you will drain your vitality meter to a point where you can't recover.  If you don't, you'll have to time your jumps safely across the clouds, including the one that drops away when you land on it.  Either way, when you land on the island, don't fear the Cobra; land on him!  He is hiding the Bonus Pot for this stage.
 * 3) Depending on how low your vitality meter is after the last section, you may need to use this section to recover.  There's nothing especially tricky about the section.  At the very end of the long island, there is a hidden fireball egg.  Watch out for the Waler that jumps out of the water in the later cloud portion.
 * 4) Another difficult cloud hopping section follows.  The most difficult aspect of this stage are the unusually low lying clouds that the Waler fish will jump through.  You have two choices: either slow down and wait for them to jump out of the water before proceeding to the next cloud, or jump down to the left edge of the next cloud, and immediately jump again to bounce over the fish.  A trio of Cavas birds wait to ambush you near the end of the stage.

Stage 2

 * 1) Your most common enemy through this section will be the Basser bats, mixed with an occasional boulder or fire, but the most dangerous threat is the Coyote attack.  Keep your eye open for the flower that signifies his appearance.  Shortly after a rock, you weapon will hit something invisible.  Keep throwing it until a platform appears to take you to a bonus stage, but watch out for the boulder that rolls along the ground.
 * 2) You'll have to deal with a number of skulls as you begin to ascend the steps in this section.  You'll come to a platform where you should wait for a boulder to drop before you continue.  On the way down, be careful of the frogs.  There's a hidden fireball egg at the bottom of the steps before the floating platform.  That next platform will drop as soon as you land on it.
 * 3) This icy section holds few surprises.  Eliminate the right facing frog if possible.  Collect the flower contained in the egg at the top of the ledge.  As you dodge the icicles, you will eventually come to the Bonus Pot.  Simply use the springboard to collect it.  Immediately after this is a rock, and egg, and a fire.  The egg contains an eggplant, so ideally, you want to jump over all of these, but you must still be wary of the falling icicles overhead.
 * 4) You will face a number of boulders throughout this section, both as you climb up the steps, and as you make your way towards the goal.  If you have fireballs, you have little to worry about, but if you don't, you must be prepared to jump over two boulders at once, or give them time to separate, which is always a little riskier.  If you're low on vitality, take the skateboard from the high ledge.  It will help you clear the jump and reach the goal faster.  Watch out for the two boulders beyond the jump, and eliminate the Basser bats near the end of the stage.

Stage 3

 * 1) For the most part, you will be ascending this mountainous stage.  Watch out for boulders, followed by large numbers of Cavas birds.  Don't miss the flower along the way.
 * 2) You will absolutely need a weapon for this next section, as many skulls are perched along entire lengths of mountaintops.  Food is also rather scarce throughout this section, so you'll need to move quickly in order to reach the next section where you can begin to collect food and restore your vitality meter again.
 * 3) This section can save you or kill you depending on how well to control your movements.  Fruit will start to appear again, albeit not very frequently.  The first egg that you come to will be a Honey Girl fairy, which will certainly help you proceed through the crowd of enemies, but you should focus on collecting the bananas and apples rather than killing enemies.  The fire that you encounter by the time the fairy is ready to leave hides the Bonus Pot so collide with it.  The last egg in the stage contains an eggplant, so avoid it at all costs.
 * 4) You will have more opportunity to collect fruit in the form of a series of springboards that will send you sailing over mountain ledges which contain fire.  You must have a good amount of speed built up to clear the fire, but if you're familiar with how to move through the bonus stages, you should have no problem rapidly accumulating fruit until you come to an egg.  This egg will contain milk, restoring all of your vitality.  However, shortly afterwards, a second egg contains an eggplant, so leave it alone.

Stage 4

 * 1) This particular first section of a fourth stage features rather congested regions of spiders.  If you have a weapon, it is easy enough to clear out, but if you don't, you'll have to time your jumps over fires so that you don't crash into spiders up above.  Collect the flower at the end.
 * 2) Prepare for the usual Coyote attack.  After jumping over two fires, you will see a frog.  There is a hidden egg between the fires and the frog, which contains a red milk bottle.  Try to remove the frog before you collect it to be safe.  Just beyond will be a springboard followed by some rocks, a fire and a spider.  Shortly beyond that is a wandering Pooter, and this Pooter hides the Bonus Pot.  You'll have to collide with him to collect it, so either launch over everything with the springboard, or let the Pooter approach you so you can hit it.
 * 3) There is a substantial army of spiders arranged in very deadly patterns.  If you have a weapon, you will have no problem, but if you don't, this is one of the most challenging sections to survive.  You must time your jumps to clear two spiders at a time, or jump through a gap created by two spiders.  Later on, an entire series of spiders will rain down from the sky with a small gap before two more spiders.  You can run beneath the first series, and jump through the gap over the last two spiders.  A Coyote attack will occur shortly after that.
 * 4) Watch the boulder as you climb up the slope.  At the top is a series of four rocks.  If you have the fireball, you can clear them, but if not, you'll have to jump over as many as you can and trip on one of them.  There is a Cobra immediately after the rocks, so don't allow yourself to fly too far forward.  This time, both platforms that lead to the boss will fall away.  To defeat the boss of World 6, you must hit him in the head 18 times.