Pass

**Very well done Emil!**

Nice interface. I like your additional features!

The code is generally good structured, but would benefit from helper functions to reduce lines.

Good job! :D

I managed to find some small optimisation possibilities. Example:
_Your code_:
```rust
// Draw piece
//...
let sprite = match self.sprites.iter().find(|x| x.0 == _piece) {
Some(x) => x.1.clone(),
_ => panic!("No piece"),
};
graphics::draw(
ctx,
&sprite,
/*...*/
)
```
_Without unnessecery cloning_:
```rust
// Draw piece
//...
graphics::draw(
ctx,
match self.sprites.iter().find(|x| x.0 == _piece) {
Some(x) => &x.1,
_ => panic!("No piece"),
},
/*...*/
)
```

Start by locating the drawing code containing the sprite lookup shown in the issue and review the surrounding implementation for the suggested clone reduction and helper extraction. Confirm the intended scope with the maintainer, since no files, tests, or completion criteria are specified.

Written by the indexing model from the issue text.