The sources, author information, and license details of all images are as follows. This work is adapted from the original images, and the image dimensions have been adjusted.

1. Microsoft Images (MIT License)

   Images: ball.png, brick_#.png, brick_A.png, brick_B.png, brick_C.png, brick_D.png, brick_E.png

   Author: Microsoft Corporation

   License: MIT License

2. Google Images (Apache 2.0 License)

   Image: KUN.png

   Author: Google Inc

   License: https://www.apache.org/licenses/LICENSE-2.0

The Apache 2.0 License requires including copyright notices, the license text, and the NOTICE file (if any), stating any modifications, and allows commercial use.

3. CraftPix.net Images (CraftPix Custom License)

   Images: background_1.png, bcakground_2.png, bcakground_3.png, bcakground_4.png, bcakground_5.png, bcakground_6.png

   Author: CraftPix.net

   License: https://craftpix.net/file-licenses/

The CraftPix license generally requires retaining copyright information, prohibits separate resale of source files, and allows use in commercial projects; please refer to their official license details for specifics.

4. game-icons.net Images (CC BY 3.0)

   Images: three_balls.png, friends.png, up_balls.png, trophy.png

   Author: Lorc, Delapouite,

   License: https://creativecommons.org/licenses/by/3.0/

The Creative Commons Attribution 3.0 (CC BY 3.0) license allows you to copy, modify, distribute, and publicly perform the work, including for commercial purposes, as long as you give proper credit to the original author. It does not allow sublicensing or applying additional restrictions, and you must clearly indicate any changes made. The work is provided “as-is” without warranties. Please refer to the full license text for complete details.