Hitbox file

is a PNG image with alpha channel (or Texture2D) that is used to determine the custom level gameplay.

The hitbox file, called level.xnb, has the size of 780x585 pixels, every screen is ordered by column starting from top to bottom which means every screen has 60x45 pixels.

Hitbox Example

Block color table

Jump King uses a specific color to define what a block is inside of this file.


block description usage color
Solid A normal block you can stand on
RGB(0,0,0)
Slope The player will slide standing on it Needs two adjacent blocks
RGB(255,0,0)
Fake The player will fall through it Used also for slopes - alters wind, water and low gravity functionalities
RGB(128,128,128)
Ice The player will slide on it but can still stand on it
RGB(0,255,255)
Snow The player cannot walk on it, but can still jump with enough power Snake Ring bypasses it
RGB(255,255,0)
Wind If placed on a screen, it will push the player slowly either left or right The wind polarity reverses every 5 seconds
RGB(0,255,0)
Sand The player will slowly fall through the block, while jumping and walking is still possible
RGB(255,106,0)
No Wind The player will fall through it Alters wind, water and low gravity functionalities
RGB(255,255,255)
Water Velocity and gravity is halved
RGB(0,170,170)
Quark read in detail
RGB(182,255,0)
Teleport If placed on a screen, it teleports the player to a specific screen using the RED of the RGB scale as the screen number Works both left and right side of the screen
RGB(1,0,255) to RGB(255,0,255)
Low gravity Velocity and gravity is between water and normal, the Y distance is slightly higher (fixed all problems related with solid platforms in v1.3.1)
RGB(128,255,255)
Wind gradients 16 values that determines the intensity of the wind From 12.5% to 200% of the original wind strength based on the gradient
RGB(192,255,0) to RGB(207,255,0)
One-way wind gradients (LEFT) 16 values that determines the intensity of the wind, the wind will never change direction. From 12.5% to 200% of the original wind strength based on the gradient
RGB(208,255,0) to RGB(223,255,0)
One-way wind gradients (RIGHT) 16 values that determines the intensity of the wind, the wind will never change direction. From 12.5% to 200% of the original wind strength based on the gradient
RGB(224,255,0) to RGB(239,255,0)
Semi-solid Block that is only solid on one side. Solid from Top (R: 65), Right (R: 66), Bottom (R: 67), Left (R: 68)
RGB(65,65,65) to RGB(68,65,65)
Warp (Like Teleport but on the same screen) The red channel equals to the X location on the screen, the green channel equals to the Y location on the screen.
RGB(0,0,75) to RGB(60,45,75)

If the red channel is still a concept you don’t understand, see it as the first RGB value (Red Green Blue) which is globally known on all image modification program.

Quark block

is a block that rounds the player to the closer in-game pixel (8 pixel distance) the player’s Y position to make falls less inconsistent.

In order to get the full potential of a quark block:

Usage

Usage (thanks to Erkstock for the image and the explaination!)


JumpKingPlus’ blocks compatibility table

block JK+ v1.1.0 or older JK+ v1.2.0 to v1.3.0 JK+ v1.3.1 JK+ v1.4.0 to v1.6.1 JK+ v1.7.0 JK+ v1.7.1 or newer
Low gravity ?
Wind gradients
One-way wind gradients
Warp
Semi-solid
Double teleport

*¹ - From version v1.2.0 to v1.3.0, there was a bug related to low gravity where the player standing on solid blocks would graphically jump. Later fixed on v1.3.1.