docs: replace crate with box in README.md

README.md

@@ -8,9 +8,9 @@ A sokoban with solver.
 
   <p align="center"><img src="./docs/assets/auto_solve.gif" width=50%></p>
 
-- **Auto move**: Supports full mouse control for automatic player movement and crate pushing. [More details](docs/auto_move.md).
+- **Auto move**: Supports full mouse control for automatic player movement and box pushing. [More details](docs/auto_move.md).
 
-  <p align="center"><img src="./docs/assets/auto_crate_push.gif" width=50%></p>
+  <p align="center"><img src="./docs/assets/auto_box_push.gif" width=50%></p>
 
 - **Level management**: Levels and solutions are stored in the database. [More details](docs/level_management.md).
 - **Customizing**: Options can be customized via configuration file. [More details](docs/customizing.md).
@@ -27,15 +27,15 @@ A sokoban with solver.
 
 ### Mouse
 
-| Key                                   | Action                                   |
-| ------------------------------------- | ---------------------------------------- |
-| Click `Left` on player reachable area | Move the character to this position      |
-| Click `Left` on a crate               | Show the pushable area of the crate      |
-| Click `Left` on crate pushable area   | Push the selected crate to this position |
-| Hold `Right` and drag                 | Adjust viewport                          |
-| Click `Button 4`                      | Undo the last push                       |
-| Click `Button 5`                      | Redo the last push                       |
-| Scroll `Middle`                       | Zoom in/out                              |
+| Key                                   | Action                                 |
+| ------------------------------------- | -------------------------------------- |
+| Click `Left` on player reachable area | Move the character to this position    |
+| Click `Left` on a box                 | Show the pushable area of the box      |
+| Click `Left` on box pushable area     | Push the selected box to this position |
+| Hold `Right` and drag                 | Adjust viewport                        |
+| Click `Button 4`                      | Undo the last push                     |
+| Click `Button 5`                      | Redo the last push                     |
+| Scroll `Middle`                       | Zoom in/out                            |
 
 ### Keyboard
 
@@ -76,4 +76,4 @@ A sokoban with solver.
 | `X`/`Square`   | Toggle instant move[^1]           |
 | `Y`/`Triangle` | Toggle automatic solution         |
 
-[^1]: Turn off character and crates movement animations.
+[^1]: Turn off character and boxes movement animations.