Seam clip

A seam clip is a precise type of clip that involves clipping through the seam where two adjacent surfaces meet at a convex angle, generally of 90 degrees or less. Clips through horizontal seams are called ledge clips, while clips through vertical seams are known as corner clips. Corner clips were previously known as crouch clips or LJCCs (short for "lol, just crouch clip"), as they were believed to only be possible while crouching, which has since been disputed.

Although both variants of seam clips are generally precise, ledge clips are often considered more difficult since it is harder to align Mario perfectly for the clip. Many ledge clips have no consistent setup. Corner clips tend to vary more in difficulty, with some being relatively easy and some being very precise.

Properties

Seam clips are made possible in locations where the gap between two adjacent surfaces is just wide enough to allow Mario to clip through. These gaps are significantly smaller than Mario, but due to the way the game handles collision, Mario will be able to clip through if he approaches the seam at just the right angle.

Ledge clips seem to be most frequent while Mario is in a dive animation, but have also been known to occur during long jumps, for instance. Corner clips are most frequently performed while Mario is walking, crouch walking, or rolling, but can also be done by diving. Where corner clips are possible, it is generally also possible to clip Cappy through the corner by throwing him at the same angle that would cause Mario to clip through.

Seam clips are also known to be possible as certain captures.

Uses

Two speedrun tricks used in the Any% run, among other categories, that utilize corner clips are Lake Clip and Ice Corner Clip. The former has a consistent setup and is used by many high-level runners, while the latter must be performed in midair and is therefore much less consistent, making it rarely used in actual speedruns.

Another trick utilizing a corner clip that is used in the World Peace and Darker Side categories is Inverted Pyramid Skip. This clip has no consistent setup at all, since it must be performed high in the air and there is no ground that can be properly used for alignment.

Locations

The following is a list of some known seam clip locations:

Kingdom	Location	Type	Video	Capture?
Cap Kingdom	The exit door at the top of Top-Hat Tower. Useful for Softlock%.	Corner	Link
Cap Kingdom	The hat-shaped airship guarded by the Bonneter.	Corner	Link
Cap Kingdom	The edge of an airship floating in the fog.	Ledge	Link
Cap Kingdom	The exit of the Paragoomba bonus room.	Corner	Link
Cap Kingdom	The exit of the Paragoomba bonus room.	Corner	Link	Paragoomba
Cascade Kingdom	The stump near the start of the kingdom.	Ledge	Link
Cascade Kingdom	The top portion of the fallen rock bridge.	Ledge	Link
Cascade Kingdom	The edge of the ground next to where the bridge lands.	Ledge	Link
Cascade Kingdom	A raised piece of ground near where the bridge lands.	Ledge	Link
Cascade Kingdom	The wall just behind the Odyssey upon first visiting the kingdom.	Ledge
Cascade Kingdom	A wall to the left of where the Odyssey is first found.	Ledge	Link
Cascade Kingdom	A small rock formation above where the Odyssey is first found.	Ledge	Link
Cascade Kingdom	The edge of the ground to the south of the T-Rex.	Ledge	Link
Cascade Kingdom	The edge of the ground to the east of the T-Rex.	Ledge	Link
Cascade Kingdom	An alcove containing purple coins below where the T-Rex resides.	Corner	Link
Cascade Kingdom	The south edge of the Madame Broode arena.	Ledge	Link
Cascade Kingdom	The edge of a 2D section in the Chasm Lifts level.	Corner	Link
Sand Kingdom	The lower portion of a building on the east side of Tostarena Town.	Ledge	Link
Sand Kingdom	The higher portion of a building on the east side of Tostarena Town.	Ledge	Link
Sand Kingdom	The south edge of the tall pillar near Tostarena Ruins.	Ledge	Link
Sand Kingdom	The north edge of the pillar with a moon on it near Tostarena Ruins.	Ledge	Link
Sand Kingdom	The south edge of the second short pillar near Tostarena Ruins.	Ledge	Link
Sand Kingdom	A diagonal seam on a ramp in the back of Tostarena Ruins.	Hybrid	Link
Sand Kingdom	A thin ledge on the side of Jaxi Ruins.	Ledge	Link
Sand Kingdom	The archway at the end of the Jaxi Driver level.	Ledge	Link
Sand Kingdom	The ground near a bridge leading to the Moe-Eye Habitat.	Ledge	Link
Sand Kingdom	One of the edges at the top of the Inverted Pyramid.	Ledge	Link
Sand Kingdom	The left edge of the 2D section on the side of the Inverted Pyramid.	Ledge	Link
Sand Kingdom	The right edge of the 2D section on the side of the Inverted Pyramid.	Ledge	Link
Sand Kingdom	A square pillar on the left side of Deepest Underground.	Ledge	Link
Sand Kingdom	A square pillar on the right side of Deepest Underground.	Ledge	Link
Sand Kingdom	The east edge of the ground surrounding the oasis.	Ledge	File
Lake Kingdom	The inside corner near End of the Hidden Passage. Known as Lake Clip.	Corner	Link
Lake Kingdom	The outside corner near End of the Hidden Passage.	Corner	Link
Lake Kingdom	The edge of the deep water well in the Water Plaza.	Ledge	Link
Wooded Kingdom	The edge of an alcove in a tree near the Odyssey.	Corner	Link
Wooded Kingdom	A tall ledge near the beginning of the Sky Garden Tower interior.	Ledge	Link
Wooded Kingdom	One of the ledges near the lower area with the Sherms.	Ledge	Link
Wooded Kingdom	Out of bounds on one of the blocks comprising the breakable rock wall.	Ledge	Link
Wooded Kingdom	A short ledge near the top of the large ramp.	Ledge	Link
Lost Kingdom	At the entrance to the room with the Cave Gardening moon.	Corner	Link
Lost Kingdom	The curved corner of the ground outside Captain Toad's location.	Corner	Link
Metro Kingdom	The edge of the entrance door within the Bullet Billding level.	Corner	Link
Snow Kingdom	The Warp Painting platform (often occurs during Snow Dram attempts).	Ledge	Link
Snow Kingdom	The outside entrance to the Rocket Flower level.	Corner	Link
Snow Kingdom	The staircase at the end of the Ty-foo room.	Ledge	Link
Snow Kingdom	The entrance door within the Icicle Cavern room.	Corner	Link
Snow Kingdom	A long edge of the ground near the start of the Icicle Cavern room.	Ledge	Link
Snow Kingdom	A smaller edge of the ground near the start of the Icicle Cavern room.	Ledge	Link
Snow Kingdom	A corner of ice in the Icicle Cavern room. Known as Ice Corner Clip.	Corner	Link
Snow Kingdom	A ledge in the back of the Icicle Cavern room.	Ledge	Link
Luncheon Kingdom	A colored ledge near the slots building in Peronza Plaza.	Ledge	Link
Luncheon Kingdom	A pillar at the south end of Peronza Plaza.	Ledge	Link
Luncheon Kingdom	A pillar in Peronza Plaza behind the Crazy Cap shop.	Ledge	Link	Fire Bro
Luncheon Kingdom	A tall ledge near the Atop the Jutting Crag moon.	Ledge	Link
Luncheon Kingdom	A ledge near the entrance to the Magma Crossing room.	Ledge	Link
Luncheon Kingdom	The side of a thin bridge near the Meat Plateau.	Ledge	Link
Luncheon Kingdom	The edge of the pot on top of the slots building.	Ledge	Link	Lava Bubble
Luncheon Kingdom	The platform at the start of the Cascading Magma room.	Ledge	Link	Lava Bubble
Luncheon Kingdom	The platform at the end of the Cascading Magma room.	Ledge	Link	Lava Bubble
Luncheon Kingdom	One of the edges of the Warp Painting island.	Ledge	Link
Ruined Kingdom	The right side of the dragon's head.	Ledge	Link
Moon Kingdom	A short wall near the entrance to the Wedding Hall.	Ledge	Link