Spike Block

Spike Blocks are reoccurring objects that first appeared Super Mario 3D World.

Super Mario 3D World
Spike Blocks first appear in Super Mario 3D World as obstacles. They damage the player when they touch them. There are blue and red variants of Spike Blocks. The blue Spike Blocks are stationary while the red Spike Blocks move.

Super Mario Maker 2
Spike Blocks reappear in Super Mario Maker 2, where they are placable objects found in the "Terrain" category. It is only present in the Super Mario 3D World game style and is similar to the Spike Trap. There are three variants of Spike Blocks that can be used. Yellow Spike Blocks are on timers which cause the spikes to protrude and retract, functioning similar to the retracting spike obstacles seen in multiple levels in the original Super Mario 3D World such as Spiky Spike Bridge. The red and blue Spike Blocks' spikes can become inactive or active under the control of an ON/OFF Switch, and as such can be toggled. The player can stand on Spike Blocks when their spikes are retracted.

Super Mario Maker 2

 * North American website bio: "This is one block you do not want to hit. Combine it with the On/Off Switch to set a trap!"