diff --git a/resources/input10.txt b/resources/input10.txt
new file mode 100644
index 0000000..92c55ed
--- /dev/null
+++ b/resources/input10.txt
@@ -0,0 +1,59 @@
+10101129874567650034554321210765017892103407621078938900189
+25410056783218921125667210329834123765212518542362347612276
+36321141094303212986768011234123434354307629030451056543345
+47898232198701203479829323105012985894398438121267787012436
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+54306148723343101014508764987878765654234500345443467654323
+45678034014546512425678755676779654342149611236912018941010
+30089121223467432338769101238988701289038723947801024562167
+21123210310598301449843212345679654374349654854383433873478
+39654303489621236556752101054541021265238765763298512901569
+78745414548710567845667698767632090780149459870187607832608
+69856789654789678956768907458952185699012343221545696543210
+54363898723652101349877812364343674018761450123456787654329
+23014578710503201231236587651254563023450761212101698765438
+10123669765414734320345698540160122198989810301032001894347
+03278754894325895610798701232873278987610167450123110983856
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+67812567432763289752112310980569503452352210909879859652165
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+65430145670323075212787032134567821059850141027632363212343
+50321232987214789100654123299851018968943256934546578921084
+21272101456105674101543234386798327877012367886757689872398
+18989872356796543232344335675647456965438943898898510765467
+09876965449887650198754326034556455540127652107001423451056
+12365054335678012267960012120345369834568941056122345432345
+01454101224589833457871457651234278923478930349234216781056
+12343232113074321012902368765445107610100121238543001894343
+87636549002155692101211079612301278543201056747652189801234
+98545678456766781012923985509210569430210149876343678900541
+01234012389858943223874346678327898121341234765454563219610
+76105654672107654114565287665456765023458985876312154398721
+85678783543765103005010196512349894311267876901203098989430
+94569892101894319876120123405432001200398701878714567876549
+03210712232101223965431893696501120165453212569210103478958
+12307803212101494367646764787017635676562343454320232167667
+05456954301092385458125655690198544387651458981011241056541
+34565766542389476329034504321239732298940567672454356787430
+23874897433476565016543213898369801107432398543963967898721
+10983218923567874387632012567456741016501476543876876987654
+32654103210898961298921253432125430323478987432101476898543
+01789034506781450101010765893036721217865430301212385301412
+32109127675650361215432894734589894306923421678903494212303
+47898008984321278926941323655678345645014984589876523424321
+56567211012454165437810015543067236732105873101017014735670
+35654343203763010121732104562170147899876562102328985898789
+43021052104892345430645243876783450147890412985403454587658
+52134569915651096584596432965692761236321309876012963210567
+67245678876720987893087341054301874345410214767623874789410
+78996567369812346782176016543210965634321323698501945674323
+89487601232109855693876127433456534565401214545432016323454
+78321032583098764102965438122167321876312300434332125412343
+65410545694567823211234349021098930989205421225649567507654
+78923210783245910340165452110187343232196510310758498678943
+67654569632156721451076326789543210143087893427867310987632
+76543678541043897569989015673434507654076596510901223898541
+89434105630012798178898724512523698723129887325877836767630
+90121234789410567016721013009618789610438798456756945478921
+81010389874323454325430122118709876321567012349843210521010
\ No newline at end of file
diff --git a/src/days/day10.rs b/src/days/day10.rs
new file mode 100644
index 0000000..bd31526
--- /dev/null
+++ b/src/days/day10.rs
@@ -0,0 +1,125 @@
+use std::path::Path;
+
+use advent_derive::advent_day;
+use itertools::Itertools;
+use itertools::iproduct;
+
+use crate::{error::AdventError, input::read_into_vec};
+use super::*;
+
+
+struct Part1 {
+    grid: Vec<Vec<u8>>,
+    width: usize,
+    height: usize
+}
+
+impl Part1 {
+    fn new() -> Self {
+        Self {
+            grid: vec![],
+            width: 0,
+            height: 0
+        }
+    }
+}
+
+type Part2 = Part1;
+
+
+fn read_input_part1(part1: &mut Part1, path: &Path) -> Result<(), AdventError> {
+    part1.grid = read_into_vec::<String>(path)?.iter().map(|s| {
+        s.chars().map(|c| c.to_digit(10).unwrap() as u8).collect::<Vec<u8>>()
+    }).collect::<Vec<Vec<u8>>>();
+    part1.width = part1.grid[0].len();
+    part1.height = part1.grid.len();
+    Ok(())
+}
+
+fn solve_part1(part1: &mut Part1) -> Result<String, AdventError> {
+    let mut trail_heads = vec![];
+    for y in 0..part1.height {
+        for x in part1.grid[y].iter().positions(|h| *h == 0) {
+            trail_heads.push((x, y));
+        }
+    }
+    let mut answer = 0;
+    for trail_head in trail_heads.into_iter() {
+        let mut trails = vec![trail_head];
+        for i in 0..9
+        {
+            let mut new_trails = vec![];
+            
+            for (x, y) in trails.iter() {
+                let reachable = generate_reachable(&part1, (*x, *y));
+                let reachable_step = reachable.into_iter().filter(|(nx, ny)| {
+                    part1.grid[*ny][*nx] == i+1
+                }).collect::<Vec<(usize, usize)>>();
+                for x in reachable_step.into_iter() {
+                    new_trails.push(x);
+                }
+            }
+            trails = new_trails;
+        }
+        answer += trails.iter().unique().count()
+    }
+
+    Ok(answer.to_string())
+}
+
+fn generate_reachable(part1: &Part1, grid_point: (usize, usize)) -> Vec<(usize, usize)> {
+    let (x, y) = grid_point;
+    let mut x_coords = vec![];
+    let mut y_coords = vec![];
+    if x > 0 {
+        x_coords.push(x-1)
+    }
+    if x < part1.width - 1 {
+        x_coords.push(x+1);
+    }
+    if y > 0 {
+        y_coords.push(y-1)
+    }
+    if y < part1.height - 1 {
+        y_coords.push(y+1);
+    }
+    iproduct!(x_coords.into_iter(), vec![y].into_iter()).chain(iproduct!(vec![x].into_iter(), y_coords.into_iter())).collect::<Vec<(usize, usize)>>()
+}
+
+fn read_input_part2(part2: &mut Part2, path: &Path) -> Result<(), AdventError> {
+    read_input_part1(part2, path)
+}
+
+fn solve_part2(part2: &mut Part2) -> Result<String, AdventError> {
+    let mut trail_heads = vec![];
+    for y in 0..part2.height {
+        for x in part2.grid[y].iter().positions(|h| *h == 0) {
+            trail_heads.push((x, y));
+        }
+    }
+    let mut answer = 0;
+    for trail_head in trail_heads.into_iter() {
+        let mut trails = vec![trail_head];
+        for i in 0..9
+        {
+            let mut new_trails = vec![];
+            
+            for (x, y) in trails.iter() {
+                let reachable = generate_reachable(&part2, (*x, *y));
+                let reachable_step = reachable.into_iter().filter(|(nx, ny)| {
+                    part2.grid[*ny][*nx] == i+1
+                }).collect::<Vec<(usize, usize)>>();
+                for x in reachable_step.into_iter() {
+                    new_trails.push(x);
+                }
+            }
+            trails = new_trails;
+        }
+        answer += trails.iter().count()
+    }
+
+    Ok(answer.to_string())
+}
+
+#[advent_day(Part1, Part2)]
+struct Day10;
diff --git a/src/days/mod.rs b/src/days/mod.rs
index 26c8eb3..c790524 100644
--- a/src/days/mod.rs
+++ b/src/days/mod.rs
@@ -24,7 +24,7 @@ pub mod day6;
 pub mod day7;
 pub mod day8;
 pub mod day9;
-
+pub mod day10;
 pub mod day14;
 
 /*
diff --git a/src/main.rs b/src/main.rs
index 0cfd35b..e4ce6c8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ use day6::Day6;
 use day7::Day7;
 use day8::Day8;
 use day9::Day9;
+use day10::Day10;
 use day14::Day14;
 
 
@@ -51,7 +52,7 @@ fn main() -> Result<(), AdventError> {
         Box::new(Day7::new()),
         Box::new(Day8::new()),
         Box::new(Day9::new()),
-        Box::new(DummyDay::new()),
+        Box::new(Day10::new()),
         Box::new(DummyDay::new()),
         Box::new(DummyDay::new()),
         Box::new(DummyDay::new()),