The snake, or eye creature, or segmented creature is in the volcano. To get past it, jump when it is fully extended. Wait for the creature to roll toward you. Step back and jump once it is laying flat.
The eye creature / lava snake / segmented monster / dice monster / rock monster is blocking your path in the volcano. You can't jump over it until it rolls toward you and then unrolls flat on the ground.
The snake / segmented creature / eye creature in the volcano attacks by rolling into you. When it forms a circle and rolls, step back as it uncoils. As soon as it is flat on the ground, jump over it.
You have to jump across the lava geysers, slip past the hot volcanic gusts, jump over the Lava Snake, and find Sir Peleas, who will give you the Ice Arrow. (see related question)
The creature (variously called the rock snake, eye monster, caterpillar, or rolling monster) unrolls to attack. When it rolls toward you, jump back as it fully unrolls. When it is flat, quickly jump over it.
The "lava creature" or "lava snake", or "eye monster" will unroll to hit you if you try to pass it in the volcano. Wait for it to roll toward you, then step back quickly as it unrolls. Quickly jump it while it is flat on the ground.
The spiky thing (rolling thing, eye creature, eye monster, lava creature, lava snake) can be jumped over when it is unrolled (flat). Wait for it to roll toward you in a loop, then step back as it uncoils. Quickly jump across it to the left.
The segmented lava creature (snake) uncoils to hit you. When it forms a circle and rolls toward you, step back. Jump over when it is completely extended.
The segmented lava creature (lava snake, eye monster) rolls toward you in the volcano. To avoid it, jump over it when it is fully extended (flat). Approach the creature, and wait for it to form a circle and roll. When it uncoils to hit you, step back, then quickly leap over it.
You hop on the lava spouts (jump from 5th to 6th while both are headed downward). Once on the last one go onto the volcano. Then climb down to the snake while avoiding the yellow air currents. Then hop over the snake and defeat the dragon by shooting an ice arrow into its mouth. (detailed solution at the related question)
The creature (variously called the rock snake, eye monster, caterpillar, or rolling monster) unrolls to attack. When it rolls toward you, jump back as it fully unrolls. When it is flat, quickly jump over it.
The creature in the volcano does not seem to have a name. It is called the lava snake, the segmented creature, the eye creature, and the rock worm. To get past it, jump over it while it is completely extended. Wait for it to roll toward you in a circle, then step back. When it rolls out flat, quickly jump over.
On the Fire PlanetYou jump from the platform you're on to the rocks floating on lava geysers. When you get to the last jump (5th to 6th rock), you jump when both rocks are moving downward. It will fall under you. Then you jump up onto the volcano and enter it.Inside the volcano, you have to hide in the nooks when the hot air blows, and at the end jump over the "eye snake" once it fully unrolls.(see related question)