If Mario goes towards the corner of a solid block, he can clip it partially or totally, depending on how he gets there. It requires much precision, so doing it without tool-assistence is nearly impossible. The technique depends on many factors, such: Mario's X and Y positions relatively to the block, X and Y speeds, Mario's status (small or ducking versus big) and whether his is mounted on Yoshi.

**Small Mario**
When Mario is small (or ducking, because both have the exact same hitboxes) and without Yoshi his chances of corner clipping a block are the worst. First off, it's impossible to do it to the right, because the block is programmed to push him to the left when he is inside it.

**Big Mario**
When Mario is big and without Yoshi he can corner clip exactly like when he's small, except that he won't be pushed to left in a certain Y interval inside the block. Thus, he can get only partially inside the block by falling faster or even clip it totally if he uses a cape to slowdow.

__Tutorial (to the left)__
1) Find the first horizontal position in which Mario won't touch the top of the block. In this example, he stands at

**X**but would fall at_{→}= 3578.F**X = 3579.0**. So the X position of entrance must be**3579.0**or more.
2) In order to corner clip, he must skip from a X position of entrance to

**X**. That means: Mario must skip from_{→}- 3 pixels**X**_{1}**≥ 3579.0**to**in one frame.****X**≤ 3575.F_{2}
Therefore

**X**._{1 - }X_{2 }≥ 3579.0 - 3575.F
Converting pixels to subpixels, we get:

**3579.0 - 3575.F = (3579 * 16 + 0) - (3575 * 16 + 15)**, because**1 pixel = 16 subpixels**and F is the 15th subpixel.
So,

**X**._{1 - }X_{2 }≥ (3579 - 3575) * 16 - 15 = 4 * 16 - 15 = 64 - 15 = 49
This implies that one needs a horizontal speed of at least 49 in order to corner clip. For this speed, there's only one position of entrance:

**3579.0**.
3) The Y speeds and positions for the entrance is pretty liberal most of the time. One must just avoid the lateral walls (blue) and the top of the block (green).

*Aproximate behavior of a block, taken from this post (in portuguese).*

In the first picture we see that the top of the block makes Mario has

**Y****. Even if he happens to get to a Y position like**_{top}= 256**260**, he will be pushed to**Y****immediately. This happens from**_{top}**Y****until**_{top}**Y**, provided that_{top}+ 8**X ≤ X**. The lateral walls starts in_{→}**Y**(without Yoshi)._{top}+ 6
With a similar reasoning and looking at the picture, Mario needs a vertical speed of at least

**33**, from**261.F**(or above) to**264.0**(or below).
4) Doing so, Mario will clip the block. He can fall very fast and activate the block or not. If he is small and there's a second block just below the first, Mario will die if he touches the top of the second one.

**Tutorial (to the right)**
1) The technique is similar. Find the first horizontal position in which Mario won't touch the top of the block. In this example, he stands at

**X****← = 3557.0**but would fall at**X = 3556.F**. So the X position of entrance must be 3556.F or less.
2) In order to corner clip, he must skip from a X position of entrance to

**. That means: Mario must skip from****X****←**+ 3 pixels**X**_{1}**≤****3556.F**to**X**_{2}**in one frame. Again, the horizontal speed must be****≥**3560.0**49**or more.

**To do**
Corner clipping with Yoshi and high speeds.

Corner clipping with Yoshi and low speeds.

Corner clipping while flying anf corner boosts.

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