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**_{→} = 3578.F but would fall at **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**_{→} - 3 pixels. That means: Mario must skip from **X**_{1}** ≥ 3579.0** to **X**_{2} ≤ 3575.F in one frame.

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**_{top} = 256. Even if he happens to get to a Y position like **260**, he will be pushed to **Y**_{top} immediately. This happens from **Y**_{top} until **Y**_{top} + 8, provided that **X ≤ X**_{→} . The lateral walls starts in **Y**_{top} + 6 (without Yoshi).

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