Keith Courage in Alpha Zones/Glacier Zone

Overworld
With a name like Glacier Zone, you can guess that the theme here will have something to do with ice. A mole enemy will approach you on your way to the first house. Flying will also appear early on. Jump over the spikes to start your trek on the first patch of ice. On ice, it is difficult to build up speed, and it is difficult to slow down, so plan your movement accordingly. After you jump over the next set of spikes, various enemies will attack you from every direction. Then you will be required to jump up a set of icy stairs. Once at the top, you must jump over the pits that lead to spikes. Watch out for the mole enemy that guards the last platform as he could push you into the spikes if you're not careful.
 * The Prophet in the first house confirms that this zone is cold. She recommends that you save up for the expensive Jewel Sword.

You'll need to cross another long path of ice, but there are no steps this time. Jump over the spikes at the end, and you'll finally reach the second and third doors. Hop up a ledge to reach the next door. Various bouncing ground enemies will attack you as you cross another stretch of ice. After a short break, you will need to jump up some icy stairs again and leap over the spike pits that you encounter along the way. Once again, watch out for the enemies that occupy the icy ledges and make sure they don't push you into the pits.
 * Nurse Nancy will heal your wounds for 400 Coins. She says the Nova hut is close by, but it's not.
 * The Weapons Master will also advise that you purchse the Jewel Sword from him when you have collected a lot of gold.
 * The Wise Wizard will sell you more Bolt Bombs for 400 Coins.

Cross another sheet of ice and you will find the next two doors. You'll have to cross one last particularly long stretch of ice before you reach the end of the zone and find the hut that transports you to the Underworld.
 * The Weapons Master will finally sell you the Jewel Sword, for the hefty price of 2400 Coins. Do be sure to buy it before you head to the Underworld.
 * A second Nurse Nancy here offers to heal your wounds for 400 Coins again. This time, she is correct that the Nova hut is close.

Underworld
Right from the start, you have the option to walk to the right along the top, or drop down through the crack in the floor to the level below. If you follow the path to the right, you will reach a wall and for forced to drop down and return to the left anyway, so you're better off dropping straight down, and descending even further to the second sub-level before proceeding to the right.

You'll have to deal with long floating skulls, and a green Dr. Sting before you reach another wall that forces you to drop down to a third sub-level. From here, you can go left or right, but left only leads to a dead-end so go right. At first, your trip will be uneventful, but eventually enemies will begin to attack, including several robots. You will encounter a green Dr. Sting just before this path dead-ends and you are forced to climb up to continue. This Dr. Sting is a good candidate to fight until you can earn a heart that extends your health meter to a maximum of eight hearts.

In order to climb back up to the second sub-level, you must jump onto the lower of the two gray platforms very carefully. You must jump on the far right edge of the pillar in order to avoid banging your head on the ledge above, cutting the height of your jump short. You must also stop yourself from flying all the way to the right, and of course you must time this jump so the gray platform doesn't disappear underneath you. Failure to do all of this correctly will result in you landing on the spikes below and dying instantly.

Back on the second sub-level, jump over the set of spikes and start making your way back to the left. Stop when you see the gray platforms leading you back up; if you go too far to the left, you may fall back down to the third level and be forced to repeat the sequence. Use the gray platforms to climb back up to the first sub-level. From here, make your way to the right, and once again stop when you see the gray platforms leading up, to avoid going too far and falling back down to the level below.

Climb back up to the surface using those gray platforms, taking care to avoid falling over the bed of spikes below the first platform. Once you reach the top, ignore the left and jump to the right. Destroy the flying robot defending the way to the icy ledge to the right, and fall down before the wall. Continue to the right, encountering another flying robot, before reaching another wall. From here you must wind your way down two more levels until you reach the pit that leads to the boss.

Boss
It seems that Stitch, the boss of ../Reverse Zone/, and Baron Chairman, the boss of ../Fire Zone/ are upset about their defeat at your hands, and have decided to team up. As long as you have the Jewel Sword, then your strategy will be fairly straightforward. Focus all of your attack on Stitch first, completely ignoring Baron Chairman and any of his flying card attacks unless you can do so without letting up your attack on Stitch. Once Stitch is defeated, your strategy against Baron Chairman should be identical to your previous fight against him; jump over his cards and swing your sword as rapidly as possibly while you jump straight up and down. With the extended range of the Jewel Sword, it should be even easier to hit him regardless of where he reappears around the screen.