Editing Cappy return cancel

A '''Cappy return cancel''', often abbreviated as '''CRC''', is a glitch that can be exploited to allow Cappy to teleport to locations very far away from Mario in [[two-player mode]]. This can be used to activate [[Checkpoint Flag|Checkpoint Flags]], trigger [[Capture|captures]], and perform other actions at a great distance. Cappy return cancels were discovered by glitch hunter [https://twitter.com/kehzou Syrkl].

The glitch involves canceling the action of Cappy teleporting to Mario's head, which most often occurs when Cappy is called to return to Mario but is unable to due to an obstruction or from being too far away. By doing this, instead of teleporting to Mario's head, Cappy can teleport to other arbitrary locations.

== Causes for Cappy's return ==
There are two primary reasons Cappy can return to Mario, both allowing a CRC to be performed if the return is successfully canceled.

=== Manual return ===
When Cappy is first separated from Mario, he is put into '''flight mode'''. In this mode, Cappy can freely maneuver as long as he stays within a certain horizontal range of Mario. He will stay in this mode indefinitely unless he hits an object that triggers a specific action, or until he is prompted to return to Mario by pressing X or Y or shaking the controller. If he is prompted to return to Mario, he will enter '''return mode''' and attempt to fly directly back toward Mario.

In most cases, Cappy will successfully fly back to Mario, but him returning this way is undesirable for CRCs, since they rely on Cappy attempting to teleport to Mario from afar. While in return mode, Cappy will teleport back onto Mario's head if he is stuck somewhere for around three fourths of a second, or if he does not return to Mario at all after around three seconds (such as by being very far away). The majority of CRCs involve Cappy returning to Mario in this manner, and players often use a [[wikipedia:Metronome|metronome]] to time the interval between when Cappy is put into return mode and when the return needs to be canceled.

=== Automatic return ===
Certain transitions, such as initiating a boss fight or entering a [[loading zone]] to another area in the same [[stage]], will cause Cappy to be placed back onto Mario's head automatically, thus teleporting from the location he was previously at. This can be canceled as well, in what is known as an '''instant CRC''', or '''ICRC'''.

A special case of the instant CRC technique known as an '''Odyssey CRC''', or '''OCRC''', can be performed just after warping to a [[Checkpoint Flag]]. When the area is loaded in while warping to a Checkpoint Flag, Cappy is briefly initialized near the position of the [[Odyssey]]. Immediately after control of Mario is gained, Cappy is teleported onto Mario's head, which can be canceled.

== Mario actions ==
In order for a CRC to be successful, at the moment Cappy's return is canceled, Mario must be performing an action that will prevent the animation of him placing Cappy back onto his head. Although [[crouching]] is most commonly used for this purpose, any of the following actions will work:

* [[Crouching]]
* [[Rolling]]
* [[Dive|Diving]] (excluding automatic dives into water)
* Performing a [[backflip]]
* Performing a [[sideflip]]
* Performing a [[spin jump]]
* Jumping on a [[Bounce Flower]]
* [[Bonk|Bonking]] (including underwater)
* [[Wall slide|Wall sliding]]<ref group="note">Wall sliding on an angled wall will treat Mario's angle as horizontal and will not allow a sloped CRC to be performed.</ref>
* Sliding down a slope
* [[Ledge grab|Ledge grabbing]]
* Climbing up from a [[ledge grab]]
* Jumping up from a [[ledge grab]]
* Climbing a pole or tree
* Swinging from a pole
* Holding an item
* Taking damage (including underwater)
* Damage from [[lava]]
* Death
* Sitting on a bench
* Riding a [[scooter]]
* Riding [[Jaxi]]
* Riding a [[Seaside Kingdom]] fountain

== Canceling Cappy's return ==
There are two primary ways to cancel Cappy's return, each with different behavior. Both of these require executing an input within a five-frame window<ref name="frame-window">https://twitter.com/aspyndumpy/status/1383618597608591365</ref> at the moment Cappy attempts to teleport back to Mario.

=== Using a jump input ===
The simplest way to cancel Cappy's return is to press one of the jump buttons (A or B) on the controller that corresponds to Cappy. This will cause Cappy to teleport to the location he is already at; in other words, he will stay in place, but will seem to disappear for a brief moment.

=== Using a flight input ===
The more useful method of canceling Cappy's return is using a flight input (X or Y, or a motion shake input). Rather than simply keeping Cappy in place, this will cause him to teleport to a new location that follows a specific geometric rule, which can be exploited to teleport Cappy to arbitrary locations.

==== Geometric rule ====
[[File:Line CRC Diagram.png|thumb|360x360px|alt=|The line analogy]]
[[File:Sphere CRC Diagram.png|thumb|360x360px|alt=|The sphere analogy]]
The rule depends on the direction Mario is facing, referred to as the '''line of sight'''. This is imagined to be a line that goes through Mario and extends infinitely both in front of and behind him. This line is normally horizontal but can extend diagonally if Mario is standing on a slope.

There are two equivalent geometric interpretations of the rule:

#Line analogy: After the CRC, Cappy will teleport to the point on the line of sight that he is closest to.
#Sphere analogy: Imagine a sphere such that Mario and Cappy are at exact opposite points of its surface. After the CRC, Cappy will teleport to the far point on the surface of the sphere that is intersected by the line of sight.

The diagrams provide visual explanations of the two rules, and it is evident from the diagrams that both rules describe the same phenomenon.

Although not necessary to gain an intuition for the mechanism, the geometric rule can be described mathematically. The location Cappy will teleport to is determined by the following vector formula:

<math>C = M + ((C_0 - M) ~ \cdot ~ F)F</math>

where <math>M</math> is Mario's position, <math>C_0</math> is Cappy's original position before the CRC, <math>C</math> is Cappy's new position after the CRC, and <math>F</math> is a [[wikipedia:Unit_vector|unit vector]] representing the direction Mario is facing. The symbol · represents the vector [[wikipedia:Dot_product|dot product]].

If a direction is being held on the left joystick on Cappy's controller at the moment of the CRC, the vector <math>F</math> will instead be equal to that direction rotated onto the plane Mario is standing on. This is also a unit vector and is necessarily parallel to the surface Mario is on, meaning that this technique cannot be used to send Cappy to a location that would not be possible from simply angling Mario in the desired direction.

==== Blocked CRCs ====
Sometimes, when performing CRCs with a flight input, Cappy will stay in his current location instead of following the geometric rule, as if the CRC was performed with a jump input instead. The exact cause of this is not known, but it seems to only occur in instances where there is collision between Mario and the targeted position of Cappy.

It was previously believed that this occurred any time there was collision between Mario and the targeted position with a surface [[wikipedia:Normal_(geometry)|normal]] facing away from Mario, meaning that Cappy would not have a clear flight path back to Mario after the CRC. This became known as the '''reverse collision theory'''. However, despite this theory sometimes being able to predict whether a CRC will be blocked, it has been noted that it is not completely correct, since in some cases a CRC will be successful despite the presence of so-called reverse collision.

== Gaining distance ==
The geometric rule dictates that Cappy's new position can be no farther from Mario than his original position. Because of this, in order for Cappy return cancels to be used in any meaningful way, it is necessary for Cappy to already be far away from Mario, although not necessarily in the desired direction. Since there is a limited horizontal range for moving Cappy normally, one of a few specific techniques must be used to get Cappy far away from Mario in preparation for a CRC.

=== Getting Cappy stuck ===
The simplest way to get Cappy far from Mario is to place him in a location where he will not have a clear return path to Mario, such as in a corner or behind a wall, and then walking away from him. This will cause Cappy to get stuck indefinitely, as long as Cappy remains in flight mode and Mario does not move to a location where Cappy is out of range but has a clear return path.

However, this method has the limitation that Mario must be able to reach a viable place to leave Cappy, which must be in the same general direction as the target location from where the CRC will be performed. It should also be noted that Cappy will be unable to move while stuck.

=== Ground pounding ===
[[File:SCRC Diagram.png|thumb|440x440px|A diagram showing the distance yielded by a sloped CRC using different slopes]]
A powerful way to gain distance as Cappy is to repeatedly [[ground pound]]. Unlike with horizontal distance, there is no limited range for how far Cappy can be below Mario before attempting to rise back up (although he will if Mario jumps). This means that ground pounding Cappy into the void can be used to send Cappy arbitrarily far during a CRC.

Due to the geometric rule, Mario needs to be standing on a slope at the time of the CRC for this technique to work, as a horizontal line of sight will result in the target position coinciding with Mario's position rather than being at a remote point.

As seen in the diagram (which depicts the sphere analogy), the optimal horizontal distance is achieved when Mario is sloped at a 45-degree angle, and the horizontal distance diminishes the flatter or steeper the angle becomes.

=== Instant CRCs ===
Instant CRCs can also result in Cappy being far from Mario at the moment of the CRC. This is most useful for Odyssey CRCs, as the Odyssey can often be very far from Mario after warping to a checkpoint.

== Timing approaches ==
There are two distinct approaches that can be used when canceling Cappy's return. The timed approach has the most flexibility, but the shake-to-win approach is easier for specific CRCs.

=== Timed ===
The most fundamental approach to performing a CRC is to press X or Y once at the moment Cappy attempts to teleport back to Mario. Using this method, known as a timed CRC, will leave Cappy in flight mode after the CRC; this is necessary to perform certain actions as Cappy such as [[Ground pound|ground pounding]], or if the player needs time to prepare a subsequent CRC.

This is the approach for which players most often use a metronome to assist with timing, due to the window for the final button press being only five frames. Some players have created metronome audio files specifically for the three-second interval used in the majority of CRCs.

=== Shake-to-win ===
There is a second approach that eliminates the need to perfectly time the final button press. This method is known as the "shake-to-win" or S2W method, and involves repeatedly shaking the controller or mashing the X/Y buttons to cancel Cappy's return.

Shake-to-win CRCs also have the additional advantage of causing Cappy to immediately [[Homing cap throw|home in]] after teleporting, which is very useful when targeting [[Capture|captures]], [[Checkpoint Flag|Checkpoint Flags]], or other similar objects.

However, there is a drawback to this approach which makes it nonviable for certain setups. When performing a timed CRC, the X or Y button is pressed exactly once to cancel Cappy's return, which causes Cappy to transition from return mode back to flight mode. However, during a shake-to-win CRC, the repeated inputs will cause Cappy to immediately revert to return mode again. In addition to making it impossible to ground pound as Cappy after the CRC, this is equivalent to initiating a second CRC, meaning that Cappy will return to Mario's head unless his return is canceled again. For setups that utilize multiple CRCs, this means the player only has a short window to properly adjust Mario's position between CRCs.

== Uses ==
{{#ev:YouTube|id = HEEPm5eImaM|400|right}}
Cappy return cancels are used in various [[Minimum Captures]] runs (most notably [[Minimum Captures Any%]]) to access [[Morning Metro]] to skip the [[Sherm]] capture, as well as skip five [[Spark pylon|spark pylons]] in [[Bowser's Kingdom]]. One can also be used to make [[Broode Skip]] much easier.

However, the usage of Cappy return cancels is not limited to Minimum Captures. Cappy return cancels can also be used for other [[Low%]] categories, including [[Minimum Jumps]] and [[Minimum Left Stick]], or to reach [[Warp Painting]] islands early, among other uses.

The following is a list of instances where Cappy return cancels are useful:
{| class="wikitable" style="clear: right"
|+
!Kingdom
!Application
!Explanation
!Video
|-
|[[Cap Kingdom]]
|[[Minimum Left Stick]], [[Minimum Music]], [[loading zone]] bypass
|Activates the [[Checkpoint Flag]] at the top of Top-Hat Tower to skip the interior section as well as the bridge.
|[https://twitter.com/MBelonies/status/1235242982195904513 Link]
|-
|[[Cap Kingdom]]
|[[Minimum Captures All Moons]]
|Captures a distant [[spark pylon]] in [[Push-Block Peril (level)|Push-Block Peril]] in order to skip the first wire.
|[https://twitter.com/RedSlay9/status/1270068190844841984 Link]
|-
|[[Cascade Kingdom]]
|[[Minimum Captures]], [[Warp Painting]] bypass
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island for an extra moon. Known as [[Broode Skip]].
|-
|[[Cascade Kingdom]]
|Boss arena escape
|Activates the globe on the [[Odyssey]] during the [[Madame Broode]] fight, in order to escape the arena.
|[https://twitter.com/kehzou/status/1242240746167496707 Link]
|-
|[[Sand Kingdom]]
|[[Warp Painting]] bypass
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island from the ground.
|[https://twitter.com/RedSlay9/status/1275899468240412672 Link]
|-
|[[Wooded Kingdom]]
|[[Minimum Captures]]
|Activates the [[Checkpoint Flag]] on the Observation Deck in order to reach it early.
|[https://twitter.com/grady964/status/1271225117763203072 Link]
|-
|[[Metro Kingdom]]
|[[Minimum Captures]], [[Star%]]
|Activates a [[Checkpoint Flag]] on the mainland from the [[Warp Painting]] island to access the kingdom early. Known as [[Morning Metro]].
|-
|[[Metro Kingdom]]
|[[Star%]]
|Captures a [[pole]] on the mainland from the [[Warp Painting]] island. Faster variant of [[Morning Metro]] known as Pole Snipe.
|-
|[[Metro Kingdom]]
|[[Star%]]
|Captures a [[spark pylon]] on the mainland from the [[Warp Painting]] island. Fastest variant of [[Morning Metro]] known as Pylon Snipe.
|-
|[[Metro Kingdom]]
|[[Loading zone]] bypass
|Captures a [[spark pylon]] at the top of New Donk City Hall to skip the interior section.
|[https://twitter.com/PSCuber77_SMO/status/1527415304858398720 Link]
|-
|[[Metro Kingdom]]
|[[Loading zone]] bypass
|Activates the [[Checkpoint Flag]] at the top of New Donk City Hall to skip the interior section.
|[https://twitter.com/grady964/status/1274743849127043072 Link]
|-
|[[Metro Kingdom]]
|[[Minimum Captures All Moons]]
|Captures a distant [[spark pylon]] in the outfit room in order to skip the first wire.
|[https://twitter.com/gradient_gray/status/1262590255632248834 Link]
|-
|[[Seaside Kingdom]]
|[[Minimum Captures]] shortcut
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island, allowing early access to it without the use of a [[Gushen]].
|-
|[[Seaside Kingdom]]
|[[Minimum Captures]] shortcut
|Activates the [[Checkpoint Flag]] on top of the lighthouse in order to skip the underwater tunnel without the use of a [[Gushen]].
|-
|[[Luncheon Kingdom]]
|[[Warp Painting]] bypass
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island from the mainland.
|[https://twitter.com/kehzou/status/1238983090573152256 Link]
|-
|[[Ruined Kingdom]]
|[[Minimum Jumps]]
|Captures the [[Mini Rocket]] at the top of the [[Roulette Tower]] room in order to skip the 2D section.
|[https://www.youtube.com/watch?v=_Xrv7nzop6Y Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Third Courtyard (Front)'' [[Checkpoint Flag]] from the start.
|[https://twitter.com/Gorganim_/status/1682491584435179522 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Third Courtyard (Rear)'' [[Checkpoint Flag]] from the start. Known as [[1 to 3]].
|[https://twitter.com/kehzou/status/1240345009620004864 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Third Courtyard (Rear)'' [[Checkpoint Flag]] from the Third Courtyard front.
|[https://twitter.com/kehzou/status/1231965989887021059 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Second Courtyard'' [[Checkpoint Flag]] from the Third Courtyard front.
|[https://www.youtube.com/watch?v=oEzRxKmEGwk Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Second Courtyard'' [[Checkpoint Flag]] from the Third Courtyard rear. Known as [[3 to 4]].
|[https://twitter.com/kehzou/status/1232038685366870017 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Souvenir Shop'' [[Checkpoint Flag]] from the Second Courtyard.
|[https://twitter.com/grady964/status/1231713484506710016 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Main Courtyard Entrance'' [[Checkpoint Flag]] from the shop island.
|[https://twitter.com/kehzou/status/1232100334345969664 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Main Courtyard'' [[Checkpoint Flag]] from the Second Courtyard.
|[https://twitter.com/kehzou/status/1232701834885644288 Link]
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the ''Inner Wall'' [[Checkpoint Flag]] from the Second Courtyard. Known as [[4 to Inner Wall]].
|-
|[[Bowser's Kingdom]]
|[[Minimum Captures]]
|Activates the [[Checkpoint Flag]] that appears in the arena after completing the kingdom from the Main Courtyard.
|[https://twitter.com/GamesJam8216/status/1755049805855051833 Link]
|-
|[[Bowser's Kingdom]]
|[[Warp Painting]] bypass
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island from the mainland.
|[https://twitter.com/kehzou/status/1238859773153435648 Link]
|-
|[[Moon Kingdom]]
|[[Minimum Capture Types]]
|Captures the [[spark pylon]] near the treasure chest in the [[Underground Moon Caverns]] to collect the moon in it without a [[Banzai Bill]] capture.
|[https://twitter.com/grady964/status/1275531090208280576 Link]
|-
|[[Moon Kingdom]]
|[[Minimum Captures]]
|Collects a cluster of three [[Regional coin|regional coins]] near the [[Moe-Eye]] in the [[Underground Moon Caverns]] from one of the other islands.
|[https://twitter.com/MinimumGateway1/status/1631753529743343617 Link]
|-
|[[Moon Kingdom]]
|[[Minimum Captures]]
|Collects a cluster of three [[Regional coin|regional coins]] in the [[Banzai Bill]] section in the [[Underground Moon Caverns]] from one of the other islands.
|[https://twitter.com/MinimumGateway1/status/1632505909657104385 Link]
|-
|[[Moon Kingdom]]
|[[Minimum Captures]]
|Collects a cluster of three [[Regional coin|regional coins]] near the [[Tropical Wiggler|Tropical Wigglers]] in the [[Underground Moon Caverns]] from one of the other islands.
|[https://twitter.com/Gorganim_/status/1680626116489256960 Link]
|-
|[[Mushroom Kingdom]]
|[[Warp Painting]] bypass
|Activates the [[Checkpoint Flag]] on the [[Warp Painting]] island from the mainland.
|[https://twitter.com/syrkl_dsc/status/1239011920247525376 Link]
|-
|[[Mushroom Kingdom]]
|[[Early Mushroom]]<ref name="early-mushroom">https://twitter.com/kehzou/status/1466900482580963334</ref>
|Captures the near pair of [[binoculars]] on the mainland from the [[Warp Painting]] island.
|[https://twitter.com/relaxmas1/status/1234271417807433730 Link]
|-
|[[Mushroom Kingdom]]
|[[Early Mushroom]]<ref name="early-mushroom" />
|Captures the far pair of [[binoculars]] on the mainland from the [[Warp Painting]] island.
|[https://twitter.com/kehzou/status/1248228519177383936 Link]
|-
|[[Darker Side (kingdom)|Darker Side]]
|[[Minimum Captures Darker Side]]
|Captures a [[frog]] at the end in order to skip the entire interior section without using the version-exclusive [[Frog Airswim]].
|[https://twitter.com/kehzou/status/1239778664314589184 Link]
|-
|[[Darker Side (kingdom)|Darker Side]]
|[[Minimum Capture Types]], [[Minimum Captures Darker Side]]
|Captures a [[spark pylon]] at the end of the interior section from the starting island.
|[https://twitter.com/GamesJam8216/status/1790182562545148004 Link]
|}

==Theorized uses==
There are a few unproven Cappy return cancels that would be useful:
{| class="wikitable"
|+
!Kingdom
!Application
!Explanation
|-
|[[Ruined Kingdom]]
|Boss arena escape
|Activates the globe on the [[Odyssey]] during the [[Ruined Dragon]] fight, in order to escape the arena.
|-
|[[Bowser's Kingdom]]
|Boss arena escape
|Activates the globe on the [[Odyssey]] during the [[RoboBrood]] fight, in order to escape the arena.
|}

==Notes==
<references group="note" />

== References==
<references />

[[Category:Glitches]]
[[Category:Low% tricks]]