diff --git a/2023/day17_clumsy_crucible/Cargo.toml b/2023/day17_clumsy_crucible/Cargo.toml
new file mode 100644
index 0000000..00f9b76
--- /dev/null
+++ b/2023/day17_clumsy_crucible/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "day17_clumsy_crucible"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[dev-dependencies]
+criterion = "0.5.1"
+
+[[bench]]
+name = "test_benchmark"
+harness = false
diff --git a/2023/day17_clumsy_crucible/challenge.txt b/2023/day17_clumsy_crucible/challenge.txt
new file mode 100644
index 0000000..2418f7b
--- /dev/null
+++ b/2023/day17_clumsy_crucible/challenge.txt
@@ -0,0 +1,123 @@
+The lava starts flowing rapidly once the Lava Production Facility is operational. As you leave, the reindeer offers you a parachute, allowing you to quickly reach Gear Island.
+
+As you descend, your bird's-eye view of Gear Island reveals why you had trouble finding anyone on your way up: half of Gear Island is empty, but the half below you is a giant factory city!
+
+You land near the gradually-filling pool of lava at the base of your new *lavafall*. Lavaducts will eventually carry the lava throughout the city, but to make use of it immediately, Elves are loading it into large [crucibles](https://en.wikipedia.org/wiki/Crucible) on wheels.
+
+The crucibles are top-heavy and pushed by hand. Unfortunately, the crucibles become very difficult to steer at high speeds, and so it can be hard to go in a straight line for very long.
+
+To get Desert Island the machine parts it needs as soon as possible, you'll need to find the best way to get the crucible *from the lava pool to the machine parts factory*. To do this, you need to minimize *heat loss* while choosing a route that doesn't require the crucible to go in a *straight line* for too long.
+
+Fortunately, the Elves here have a map (your puzzle input) that uses traffic patterns, ambient temperature, and hundreds of other parameters to calculate exactly how much heat loss can be expected for a crucible entering any particular city block.
+
+For example:
+
+```
+2413432311323
+3215453535623
+3255245654254
+3446585845452
+4546657867536
+1438598798454
+4457876987766
+3637877979653
+4654967986887
+4564679986453
+1224686865563
+2546548887735
+4322674655533
+
+```
+
+Each city block is marked by a single digit that represents the *amount of heat loss if the crucible enters that block*. The starting point, the lava pool, is the top-left city block; the destination, the machine parts factory, is the bottom-right city block. (Because you already start in the top-left block, you don't incur that block's heat loss unless you leave that block and then return to it.)
+
+Because it is difficult to keep the top-heavy crucible going in a straight line for very long, it can move *at most three blocks* in a single direction before it must turn 90 degrees left or right. The crucible also can't reverse direction; after entering each city block, it may only turn left, continue straight, or turn right.
+
+One way to *minimize heat loss* is this path:
+
+```
+2>>34^>>>1323
+32v>>>35v5623
+32552456v>>54
+3446585845v52
+4546657867v>6
+14385987984v4
+44578769877v6
+36378779796v>
+465496798688v
+456467998645v
+12246868655<v
+25465488877v5
+43226746555v>
+
+```
+
+This path never moves more than three consecutive blocks in the same direction and incurs a heat loss of only `*102*`.
+
+Directing the crucible from the lava pool to the machine parts factory, but not moving more than three consecutive blocks in the same direction, *what is the least heat loss it can incur?*
+
+Your puzzle answer was `855`.
+
+\--- Part Two ---
+----------
+
+The crucibles of lava simply aren't large enough to provide an adequate supply of lava to the machine parts factory. Instead, the Elves are going to upgrade to *ultra crucibles*.
+
+Ultra crucibles are even more difficult to steer than normal crucibles. Not only do they have trouble going in a straight line, but they also have trouble turning!
+
+Once an ultra crucible starts moving in a direction, it needs to move *a minimum of four blocks* in that direction before it can turn (or even before it can stop at the end). However, it will eventually start to get wobbly: an ultra crucible can move a maximum of *ten consecutive blocks* without turning.
+
+In the above example, an ultra crucible could follow this path to minimize heat loss:
+
+```
+2>>>>>>>>1323
+32154535v5623
+32552456v4254
+34465858v5452
+45466578v>>>>
+143859879845v
+445787698776v
+363787797965v
+465496798688v
+456467998645v
+122468686556v
+254654888773v
+432267465553v
+
+```
+
+In the above example, an ultra crucible would incur the minimum possible heat loss of `*94*`.
+
+Here's another example:
+
+```
+111111111111
+999999999991
+999999999991
+999999999991
+999999999991
+
+```
+
+Sadly, an ultra crucible would need to take an unfortunate path like this one:
+
+```
+1>>>>>>>1111
+9999999v9991
+9999999v9991
+9999999v9991
+9999999v>>>>
+
+```
+
+This route causes the ultra crucible to incur the minimum possible heat loss of `*71*`.
+
+Directing the *ultra crucible* from the lava pool to the machine parts factory, *what is the least heat loss it can incur?*
+
+Your puzzle answer was `980`.
+
+Both parts of this puzzle are complete! They provide two gold stars: \*\*
+
+At this point, you should [return to your Advent calendar](/2023) and try another puzzle.
+
+If you still want to see it, you can [get your puzzle input](17/input).
\ No newline at end of file
diff --git a/2023/day17_clumsy_crucible/src/lib.rs b/2023/day17_clumsy_crucible/src/lib.rs
new file mode 100644
index 0000000..a8a0320
--- /dev/null
+++ b/2023/day17_clumsy_crucible/src/lib.rs
@@ -0,0 +1,170 @@
+use core::fmt::Display;
+use std::collections::{HashMap, BinaryHeap};
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum MapError {
+    NoPath,
+    ParseIntError(char),
+}
+
+impl Display for MapError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::NoPath => write!(f, "Unable to find any path from start to destination"),
+            Self::ParseIntError(e) => write!(f, "Unable to parse into integer: {e}"),
+        }
+    }
+}
+
+#[derive(PartialEq, Eq)]
+enum CrucibleType { Normal, Ultra, }
+
+impl CrucibleType {
+    fn min(&self) -> u8 {
+        match self {
+            Self::Normal => 1,
+            Self::Ultra => 4,
+        }
+    }
+
+    fn max(&self) -> u8 {
+        match self {
+            Self::Normal => 3,
+            Self::Ultra => 10,
+        }
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Hash)]
+enum Direction {
+    North,
+    West,
+    East,
+    South,
+}
+
+impl Direction {
+    fn coming_from(&self, (x, y): (usize, usize)) -> (usize, usize) {
+        match self {
+            Self::North => (x, y-1),
+            Self::West => (x-1, y),
+            Self::East => (x+1, y),
+            Self::South => (x, y+1),
+        }
+    }
+
+    fn perpendicular(&self) -> [Self; 2] {
+        match self {
+            Self::North | Self::South => [Self::West, Self::East],
+            Self::West | Self::East => [Self::North, Self::South],
+        }
+    }
+
+    fn positions_with(&self, (x, y): (usize, usize), dist: u8, crucible_type: &CrucibleType) -> Vec<((usize, usize), Self, u8)> {
+        let (min, max) = (crucible_type.min(), crucible_type.max());
+        match (self, dist, x, y) {
+            (Self::North, s, _, 0) if s < min => Vec::new(),
+            (Self::West, s, 0, _) if s < min => Vec::new(),
+            (d, s, x, y) if s < min => vec![(d.coming_from((x, y)), *d, s+1)],
+            (d, m, x, y) if m == max => d.perpendicular()
+                                            .iter()
+                                            .filter(|dir| (x > 0 || dir != &&Self::West) && (y > 0 || dir != &&Self::North))
+                                            .map(|dir| (dir.coming_from((x, y)), *dir, 1))
+                                            .collect(),
+            (d, n, x, y) => d.perpendicular()
+                                            .iter()
+                                            .map(|dir| (dir, 1))
+                                            .chain(std::iter::once((d, n+1)))
+                                            .filter(|(dir, _dist)| (x > 0 || dir != &&Self::West) && (y > 0 || dir != &&Self::North))
+                                            .map(|(dir, dist)| (dir.coming_from((x, y)), *dir, dist))
+                                            .collect(),
+
+        }
+    }
+}
+
+#[derive(PartialEq, Eq)]
+struct State {
+    estimated_costs: usize,
+    pos: (usize, usize),
+    dir: Direction,
+    dist: u8,
+}
+
+impl PartialOrd for State {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for State {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        other.estimated_costs.cmp(&self.estimated_costs)
+    }
+}
+
+pub fn run(input: &str) -> Result<(usize, usize), MapError> {
+    let map = input.lines().map(|line| line.chars().map(|c| c.to_digit(10).ok_or(MapError::ParseIntError(c)).map(|n|n as u8)).collect::<Result<Vec<u8>, _>>()).collect::<Result<Vec<_>, _>>()?;
+    let first = cheapest_path(&map, &CrucibleType::Normal)?;
+    let second = cheapest_path(&map, &CrucibleType::Ultra)?;
+    Ok((first, second))
+}
+
+fn cheapest_path(map: &[Vec<u8>], crucible_type: &CrucibleType) -> Result<usize, MapError> {
+    let dest = (map.last().unwrap().len()-1, map.len()-1);
+    let mut costs = HashMap::from([(((0, 0), Direction::East, 0), 0), (((0, 0), Direction::South, 0), 0)]);
+    let mut open_set = BinaryHeap::from([
+                                      State{ estimated_costs: dest.0 + dest.1, pos: (0, 0), dir: Direction::East, dist: 0, }, 
+                                      State{ estimated_costs: dest.0 + dest.1, pos: (0, 0), dir: Direction::South, dist: 0, },
+                        ]);
+
+    while let Some(state) = open_set.pop() {
+        let (pos, dir, dist) = (state.pos, state.dir, state.dist);
+        let old_costs = *costs.get(&(pos, dir, dist)).unwrap();
+        if pos == dest {
+            if dist >= crucible_type.min() {
+                return Ok(old_costs);
+            } else {
+                continue;
+            }
+        }
+        for (new_pos, new_dir, new_dist) in dir.positions_with(pos, dist, crucible_type) {
+            if new_pos.1 <= dest.1 && new_pos.0 < map[new_pos.1].len() {
+                let new_costs = old_costs + map[new_pos.1][new_pos.0] as usize;
+                let new_est = new_costs + dest.0.abs_diff(new_pos.0) + dest.1.abs_diff(new_pos.1);
+                let best_so_far = if new_dist > crucible_type.min() {
+                    (crucible_type.min()..=new_dist).map(|i| *costs.get(&(new_pos, new_dir, i)).unwrap_or(&usize::MAX)).min().unwrap()
+                } else {
+                    *costs.get(&(new_pos, new_dir, new_dist)).unwrap_or(&usize::MAX)
+                };
+                if new_est < best_so_far {
+                    costs.insert((new_pos, new_dir, new_dist), new_costs);
+                    open_set.push(State{ estimated_costs: new_est, pos: new_pos, dir: new_dir, dist: new_dist, });
+                }
+            }
+        }
+    }
+    Err(MapError::NoPath)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::read_to_string;
+
+    fn read_file(name: &str) -> String {
+        read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
+    }
+
+    #[test]
+    fn test_sample() {
+        let sample_input = read_file("tests/sample_input");
+        assert_eq!(run(&sample_input), Ok((102, 94)));
+    }
+
+    #[test]
+    fn test_challenge() {
+        let challenge_input = read_file("tests/challenge_input");
+        assert_eq!(run(&challenge_input), Ok((855, 980)));
+    }
+}
diff --git a/2023/day17_clumsy_crucible/tests/challenge_input b/2023/day17_clumsy_crucible/tests/challenge_input
new file mode 100644
index 0000000..c3884e8
--- /dev/null
+++ b/2023/day17_clumsy_crucible/tests/challenge_input
@@ -0,0 +1,141 @@
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diff --git a/2023/day17_clumsy_crucible/tests/sample_input b/2023/day17_clumsy_crucible/tests/sample_input
new file mode 100644
index 0000000..f400d6e
--- /dev/null
+++ b/2023/day17_clumsy_crucible/tests/sample_input
@@ -0,0 +1,13 @@
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