Unity, C#, Puzzle, Fifteen-puzzle,

I am looking for a programmer to implement a project on the theme of a puzzle game.
First of all, a developer is needed who will create the mechanism, visually design it based on examples; in this project, only the game mechanism is being developed, the visual part separately.

1. General concept Casual puzzle game with three mini-games. The player's goal is to uncover all the pictures in the gallery by completing levels in different difficulty modes. (It does not matter in which difficulty and in which game the player completes the level, the level is considered completed)

2. Gameplay

2.1 Difficulty modes EASY → grid 3×3 (9 pieces). HARD → grid 4×4 (16 pieces). The difficulty only affects the size of the grid. 2.2 Mini-games Fifteen (SLIDE) The field is divided into 3×3 / 4×4. One cell is empty. Clicking on an adjacent puzzle moves it to the empty space. Victory — all pieces in the correct order. Provide a button RESTART (the player may get stuck). Rotation (ROTATE) All pieces of the image are present on the field. Clicking rotates the puzzle 90° clockwise. Correctly oriented pieces are highlighted (semi-transparent glow). When the entire picture is assembled, the glow disappears and the final image is formed. Swap (SWAP) All pieces are present on the field. The player can select any 2 puzzles and swap them. There is no limit on the number of moves. Victory — the assembled picture.

3. Mechanism for cutting the picture into puzzles = 3x3, 4x4. (If shortened, when replacing assets in the game folder, the assets in the game itself are replaced without the programmer's intervention) Only the game needs to be built.