repeatCountPerLevel property
It determines how often this image could repeat in the same level. Affects only for BG images. 1 means it appear once per level. 2 means it appear twice per level. 0.5 means it appear once every two levels. TIP: Try to assign a value which is a factor of LevelMapParams.levelCount. It helps to equally distribute the images.
Implementation
final double repeatCountPerLevel;