Puzzle_v4

I made a fun modle of developmental game. It's an fourth edition.

Game Instructions:
1.The modle requires three colors of rollball and the quantities respectively are 12.
2.Shuffling the colors of rollball.
3.Using the sliding block to arrange the colors of rollball.

Enjoy it.
This model was printed using PLA. (fill in 10%，using a lower layer hight 0.2mm，no support)