Stone Spike

Stone Spikes are a variant of Spikes that first appear in New Super Mario Bros. Wii. They are blue in color and have green hair (the opposite of Spikes' coloration). They act like normal Spikes, but are found in mountainous regions and throw spiked balls made out of rock.

New Super Mario Bros. Wii
In New Super Mario Bros. Wii, they are found in World 6-1 and in World 8-4. Unlike normal Spikes, Stone Spikes can only throw their spiked balls downwards, rather than forwards or backwards. They can be defeated just like normal Spikes: by jumping on its head, by throwing a fireball at it, or by freezing them using an Ice Flower or a Penguin Suit.

New Super Mario Bros. U / New Super Luigi U
Stone Spikes reappear in New Super Mario Bros. U. Their behavior is similar to New Super Mario Bros. Wii, although there is an aesthetic difference in that their rocks are colored dark brown. They appear in the level Dry Desert Mushrooms in Layer-Cake Desert, where they are the main obstacles.

In New Super Luigi U they appear in Stone Spike Conveyors where they are once again the main obstacle.

Mario Party: Island Tour
Stone Spikes appear in Mario Party: Island Tour in the minigame Mad Ladders. Here they throw spiked balls down the cliffside as obstacles for the players.

Mario Sports Superstars
Stone Spikes, alongside their parent species, Spikes, make their playable debut in a Mario sports game as selectable teammates in Mario Sports Superstars, being selectable in soccer and baseball. Their character type is Power, meaning that their shots are fast and powerful. They also appear as bosses in the Road to Superstar mode.

Mario Tennis Aces
In Mario Tennis Aces, Stone Spikes are seen in the audience during tennis matches.

Paper Mario: The Origami King
Stone Spikes make their Paper Mario series debut as enemies in Paper Mario: The Origami King. In battle, their origami variants behave quite similarly to normal Spikes, albeit with slightly different damage outputs. A Paper Macho version also appears on Scuffle Island as one of the seven opponents. Curiously, normal Stone Spikes do not appear in the game.

Paper Mario: The Origami King

 * Gallery description: You can't break a Blue Stone Spike's rocks with a hammer, so just do your best to avoid them altogether.