diff --git a/2022/inputs/day12 b/2022/inputs/day12
new file mode 100644
index 0000000..45dff51
--- /dev/null
+++ b/2022/inputs/day12
@@ -0,0 +1,41 @@
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diff --git a/2022/src/bin/day12.rs b/2022/src/bin/day12.rs
new file mode 100644
index 0000000..0148910
--- /dev/null
+++ b/2022/src/bin/day12.rs
@@ -0,0 +1,61 @@
+#![feature(test)]
+extern crate test;
+use aoc2022::{
+    boilerplate,
+    common::*,
+    grid::{Grid, Position2D, VecGrid},
+};
+
+const DAY: usize = 12;
+type Parsed = (Position2D, Position2D, VecGrid<u8>);
+
+fn find_and_modify(grid: &mut Vec<Vec<u8>>, needle: u8, replacement: u8) -> (usize, usize) {
+    grid.iter_mut()
+        .enumerate()
+        .find_map(|(x, line)| {
+            line.iter_mut()
+                .enumerate()
+                .find_map(|(y, b)| {
+                    (b == &needle).then(|| {
+                        *b = replacement;
+                        y
+                    })
+                })
+                .map(|y| (x, y))
+        })
+        .unwrap()
+}
+
+fn parse_input(raw: &str) -> Parsed {
+    let mut grid = VecGrid::from_bytes_2d(raw, |b| b);
+    let start = find_and_modify(&mut grid.fields, b'S', b'a');
+    let start = Position2D::from([start.0, start.1]);
+    let end = find_and_modify(&mut grid.fields, b'E', b'z');
+    let end = Position2D::from([end.0, end.1]);
+    (start, end, grid)
+}
+
+fn part1((start, end, grid): &Parsed) -> usize {
+    let mut distances = VecGrid { fields: vec![vec![usize::MAX; grid.fields[0].len()]; grid.len()] };
+    distances[*start] = 0;
+    0
+}
+
+fn part2(parsed: &Parsed) -> usize {
+    unimplemented!()
+}
+
+boilerplate! {
+    TEST_INPUT == "Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi",
+    tests: {
+        part1: { TEST_INPUT => 31 },
+        part2: { TEST_INPUT => 0 },
+    },
+    bench1 == 0,
+    bench2 == 0,
+    bench_parse: |&((sx, sy), (ex, ey), _)| ((sx, sy), (ex, ey)) => ((20, 0), (20, 145)),
+}
diff --git a/2022/src/grid.rs b/2022/src/grid.rs
index 0296b29..1981cd6 100644
--- a/2022/src/grid.rs
+++ b/2022/src/grid.rs
@@ -3,10 +3,15 @@ pub mod position;
 pub use direction::*;
 use itertools::{join, Itertools, MinMaxResult};
 pub use position::*;
-use std::{collections::HashMap, fmt::Display, hash::BuildHasher};
+use std::{
+    collections::HashMap,
+    fmt::Display,
+    hash::BuildHasher,
+    ops::{Index, IndexMut},
+};
 
 #[allow(clippy::len_without_is_empty)] // I mainly have this for assertions in benchmarks
-pub trait Grid<T, const D: usize> {
+pub trait Grid<T, const D: usize>: Index<PositionND<D>, Output = T> + IndexMut<PositionND<D>> {
     fn get(&self, pos: &PositionND<D>) -> Option<&T>;
 
     fn insert<Pos: Into<PositionND<D>>>(&mut self, pos: Pos, element: T);
@@ -19,6 +24,19 @@ pub struct HashGrid<T: Default, const D: usize> {
     pub fields: HashMap<PositionND<D>, T>,
 }
 
+impl<T: Default, const D: usize> Index<PositionND<D>> for HashGrid<T, D> {
+    type Output = T;
+    fn index(&self, index: PositionND<D>) -> &Self::Output {
+        &self.fields[&index]
+    }
+}
+
+impl<T: Default, const D: usize> IndexMut<PositionND<D>> for HashGrid<T, D> {
+    fn index_mut(&mut self, index: PositionND<D>) -> &mut Self::Output {
+        self.fields.get_mut(&index).expect("Key not in map")
+    }
+}
+
 impl<T: Default, const D: usize> Grid<T, D> for HashGrid<T, D> {
     fn get(&self, pos: &PositionND<D>) -> Option<&T> {
         self.fields.get(pos)
@@ -68,6 +86,19 @@ impl<T> Grid<T, 2> for VecGrid<T> {
     }
 }
 
+impl<T> Index<Position2D> for VecGrid<T> {
+    type Output = T;
+    fn index(&self, index: Position2D) -> &Self::Output {
+        &self.fields[index.0[0] as usize][index.0[1] as usize]
+    }
+}
+
+impl<T> IndexMut<Position2D> for VecGrid<T> {
+    fn index_mut(&mut self, index: Position2D) -> &mut Self::Output {
+        &mut self.fields[index.0[0] as usize][index.0[1] as usize]
+    }
+}
+
 impl<T: Copy> VecGrid<T> {
     pub fn from_bytes_2d<F: FnMut(u8) -> T + Copy>(raw: &str, f: F) -> VecGrid<T> {
         VecGrid { fields: raw.lines().map(|l| l.bytes().map(f).collect()).collect() }