Client Level Start String

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The start level string consists of information about the starting state of the level and the objects it contains. It is encoded in base64. Its raw representation is formatted as follows:

{level_start};{object_string}, where

level_start is the level start object,
object_string is the object string.

Theoretically, the start level string in its entirety is the object string, however the level start object is treated specially, unlike every other object, and doesn’t even have an ID.

Level Start Object

The level start object has the following properties, formatted as {key},{value},{key},{value}

Key	Name	Type	Description
kA1	AudioTrack	Integer	The audio track which the level uses
kA2	Gamemode	Gamemode	the gamemode the player starts with
kA3	Mini Mode	bool	determines whether the player starts off as mini Mode
kA4	Speed	Speed	the speed of the level at the start
kA5	Obj-2 Blending	bool	(deprecated since 1.9) Whether Object-2 (color channel 1) uses blending or not
kA6	Background Texture ID	integer	the ID of the background texture that is being used in the level (enumerated in the same order as appears)
kA7	Ground Texture ID	integer	the ID of the ground texture that is being used in the level (enumerated in the same order as appears)
kA8	Dual Mode	bool	determines whether the player starts off in dual Mode
kA9	Level/Start Pos Object	bool	determines whether this object represents a Level Start or a Start Pos object (true for the latter)
kA10	2-Player Mode	bool	determines whether 2-Player Mode is toggled on for this level
kA11	Flip Gravity	bool	determines whether the player starts off in flipped Gravity
kA12	Color3 Blending (UNUSED)	bool	Unused, apparently meant to determine whether color channel 3 is blending or not
kA13	Song Offset	float	the song offset in seconds from which the level begins
kA14	Guidelines	Guideline String	the editor song guidelines of the level
kA15	Fade In	bool	determines whether the song will fade in as soon as the level starts
kA16	Fade Out	bool	determines whether the song will fade in as soon as the level ends
kA17	Ground Line	integer	the ID of the ground line that is being used in the level
kA18	Font	integer	the ID of the font that is being used in the level
kA20	Reverse Gameplay	bool	Whether gameplay is reversed at the start
kA22	Platformer Mode	Bool	If the level is in Classic Mode (0) or Platformer Mode (1)
kA25	Middleground Texture ID	integer	the ID of the middleground texture that is being used in the level (enumerated in the same order as appears)
kA27	Allow Multi-Rotation	bool	(Compatibility setting) Whether you can run multiple rotation actions on the same target group or not
kA28	Mirror Mode	bool	Whether the screen is mirrored at the start
kA29	Rotate Gameplay	bool	Whether gameplay is rotated at the start
kA31	Enable Player Squeeze	bool	(Compatibility setting) Whether the player can be killed by being squeezed between 2 objects
kA32	Fix Gravity Bug	bool	(Compatibility setting) Whether the bug where flipped gravity behaves differently from normal is fixed
kA33	Fix Negative Scale	bool	(Compatibility setting) Whether negatively scaled objects have correct hitboxes (1) or not (0)
kA34	Fix Robot Jump	bool	(Compatibility setting) Whether the robot can jump very high with a pad (0) or not (1)
kA36	Spawn Group	integer	The group at which the player spawns
kA37	Dynamic Level Height	bool	(Compatiblity setting) Whether the level ceiling is affected by higher objects
kA38	Sort Groups	bool	(Compatibility setting) Whether groups are spawn triggered left to right or not
kA39	Fix Radius Collision	bool	(Compatibility setting) Whether the player’s hitbox has a circle for circular hazard collision or not
kA40	Enable 2.2 Changes	bool	(Compatibility setting) Whether miscellaneous 2.2 changes are enabled or not
kA41	Allow Static-Rotate	bool	(Compatibility setting) Whether static objects can be rotated or not
kA42	Reverse Sync	bool	(Compatibility setting) Whether the player’s speed is changed when reversing to preserve music sync
kA43	No Time Penalty	bool	Whether you get a point penalty for time (0) or not (1) in platformer
kA45	Decrease Boost Slide	bool	(Compatibility setting) Whether the player receives a lesser boost in Platformer when boosted by dash orb or moving platforms
kS38	Colors	Color String	the color channels that are being used in this level
kS39	Color Page	integer	the color page which was last displayed in the color channel display window

Pre-2.0 Keys

The following keys were valid prior to 2.0 and are deprecated, since they are included in the new kS38 key. They all represented a color channel that is now indexed through the respective color channel ID.

Key	Name	Color Channel ID
kS29	BG Color	1000
kS30	Ground Color	1001
kS31	Line Color	1002
kS32	Object Color	1004
kS33	Color 1	1
kS34	Color 2	2
kS35	Color 3	3
kS36	Color 4	4
kS37	3DL Color	1003

Pre-1.9 Keys

The following keys were valid prior to 1.9 and were deprecated as of 1.9, since they were included in the keys kS29-kS33. Each color, instead of using one key, used 3 keys to represent Red, Green, and Blue values, respectively. In 1.7 and 1.8, the game used a fourth key to determine if a color channel used a player color, and which player color it would use.

Key(s)	Name	Key in 1.9
kS1-kS3	BG Color	kS29
kS4-kS6	Ground Color	kS30
kS7-kS9	Line Color	kS31
kS10-kS12	Object Color	kS32
kS13-kS15	Obj-2 Color	kS33
kS16	BG Player Color	kS29
kS17	Ground Player Color	kS30
kS18	Line Player Color	kS31
kS19	Object Player Color	kS32
kS20	Obj-2 Player Color	kS33

Keys kS16-kS20 used to determine the player color that was being used and their values were interpreted according to the following table:

Value	Color
0	Neither
1	Player Color 1
2	Player Color 2

Start Pos Object

The Start Pos object has the same special properties the level start object has, with a few not working and with a few exclusive ones, listed at the bottom. kA9 must be set to 1 in the case that the object is indeed a Start Pos.

Specifically, the only functional properties in a Start Pos object are the ones involving gameplay state, thus excluding visual-related ones (BG/ground textures, font, colors, etc.)

Confirmed properties that do not work in the Start Pos:

Key
kA5
kA6
kA7
kA10
kA13
kA14
kA15
kA16
kA18
kS*

Since 2.2, the Start Pos object has its own unique properties that do not work in the Level Start object. This is a table of all of them:

Key	Name	Type	Description
kA19	Target Order	Integer	The Target Order property of the Start Pos
kA21	Disable	bool	Whether the Start Pos is disabled
kA26	Target Order	Integer	The Target Channel property of the Start Pos
kA35	Reset Camera	bool	Whether the camera is reset when playing from this Start Pos