A spinpound, sometimes written as spin pound, is a move that is performed by pressing the crouch button during a spin jump.
Unlike a regular ground pound, a spinpound does not stall in midair; Mario will immediately accelerate toward the ground.
To make Mario spin, the joystick must be rotated in two full circles; however, spins can be buffered, meaning the two rotations can be performed during another animation so that Mario is spinning immediately upon returning to his normal state.
Buffered spinpounds, also occasionally called bumps, are a very effective way of performing a ground pound quickly, since the action of spinning, jumping and ground pounding can all be performed in rapid succession. Additionally, they can be used to reach maximum roll speed quickly if a roll action is added to the end of the input sequence, or used to execute a fast ground pound jump. All of these movement sequences are used extremely often in all types of speedruns.
To perform a spinpound:
- Spin the left analog stick so that it completes two full rotations;
- Press the jump button and immediately follow it with the crouch button;
- If spinpounding to gain speed, press X or Y to roll; if spinpounding into a jump, press A or B.
Spinpounds can differ in speed depending on how fast they are executed; a perfect spinpound can be performed in just four frames.
Spinpounds serve almost all the same purposes as regular ground pounds: transitioning into a roll or ground pound jump, killing enemies, breaking crates, activating switches, and revealing Power Moons, just to name a few. There is one notable exception: a spinpound cannot be used to perform a downthrow, unlike a regular ground pound. However, this actually works to speedrunners' advantage, since the lack of a window to perform a downthrow means the spinpound can transition into a roll instantaneously.
Spins can be buffered during any other movement animation, while Mario is in midair or as certain cutscenes are ending, and Mario will begin spinning as soon as he is in his normal state on the ground again. This is done by performing the two stick rotations during the prior animation. In speedruns, buffered spinpounds are often used to gain height quickly by means of a spinpound jump, to accelerate quickly by spinpounding into a roll, or simply in place of a standard ground pound.
A well executed buffered spinpound is slightly faster than initiating a roll regularly. This time save is more noticeable if one wishes to roll into a direction different from the one Mario is facing, because the spinpound eliminates the process of turning Mario to face the desired direction.
Aside from movement, most ledge clip setups feature spinpounds at some points, though the setups are usually very unreliable.
A silent spinpound is when a spinpound does not generate the usual sound or animation accompanied by a spinpound. There are two main causes of silent spinpounds, each with different behavior:
- If the crouch button is released just before Mario touches the ground during a spinpound, Mario will not appear to pound the ground, but actions that require a ground pound (such as revealing a Power Moon) will be triggered. In this case, Mario will not encounter the momentary stun animation that normally occurs just as he pounds the ground. Additionally, Mario cannot perform a ground pound jump following this type of silent spinpound, and will perform a regular jump instead.
- If Cappy returns to Mario just as he pounds the ground, the ground pound sound and particle effects that normally occur during a spinpound will not be present. Unlike the other type of silent spinpound, this one is purely visual/auditory and has no physical differences, and Mario can still follow it up with a ground pound jump.