All six spike variants
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The moving spike floor and ceiling, as seen in World 1
Toward the start of World 1, thereis rock structure with spikes covering the floor and the ceiling, continuously moving up and down. On the floor are two poles topped with spikes, and above the ceiling are blocks with all their sides covered with tiny spikes. While the spikes themselves aren't any more dangerous than your typical spike, the structure on which they are attached to makes dodging them more of a challenge.
Triggered spikes, as seen in World 2
Some spikes are triggered, and will speedily move in a certain direction when the plr reaches a certain level of elevation and latitude. These spikes make some sections of the game harder than they would be in almost any other game with spikes. One spike in particular (the higher one in the image to the right) doesn't go in the direction first-time players would expect it to. While it points upward, it dashes to the left to keep the player from incorrectly completing the section (going up the right path instead of the left).
The alternated positions ofjcontrolled spikes, as seen in World 2
At the end of Worlds 2 and 7 and in the middle of World 10, there are spikes that sink into and pop out of the ground for every time the player jumps, double jumps, and xtra double jumps. After sinking into the ground and coming back out, the bases of the spikes will disappear, making it possible to distinguish which ones move and which ones are stationary.
Be careful when dealing with these kind of spikes while save points are around, as it is possible to spawn kill yourself, forcing you to make a new save file.
The downward-moving spike strip, as seen in World 3
On the second screen of World 3, there is a vertical strip made entirely out of spikes with their bases conjoined with other spikes. The strip continuously moves downward, and within the strip is a small opening for the player to jump through. When first reaching the strip, the player is required to jump through the opening twice, from the lower right side the first time, and from the higher left side the second time. To attempt passing the space and succeeding requires focus and timing.
After collecting the cake from World 5, instead of having to time jump, you can walk off the heart cube to the left of the strip, and walk into the space and onto the cube just to the bottom right of it.
(to be continued)