diff --git a/Cargo.lock b/Cargo.lock
index ace30be..0b40c51 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -70,6 +70,8 @@ dependencies = [
  "derive_builder",
  "expanduser",
  "futures",
+ "grid",
+ "indicatif",
  "itertools",
  "rayon",
  "regex",
@@ -279,6 +281,19 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "console"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c926e00cc70edefdc64d3a5ff31cc65bb97a3460097762bd23afb4d8145fccf8"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "unicode-width",
+ "windows-sys 0.45.0",
+]
+
 [[package]]
 name = "constant_time_eq"
 version = "0.1.5"
@@ -463,6 +478,12 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.33"
@@ -674,6 +695,15 @@ version = "0.28.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
 
+[[package]]
+name = "grid"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1584ff6141ecb0340eeb8be523d027e3e1fe92ae34d9380a98ea991d65c564cc"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "h2"
 version = "0.3.22"
@@ -846,6 +876,19 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "indicatif"
+version = "0.17.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb28741c9db9a713d93deb3bb9515c20788cef5815265bee4980e87bde7e0f25"
+dependencies = [
+ "console",
+ "instant",
+ "number_prefix",
+ "portable-atomic",
+ "unicode-width",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.12"
@@ -1016,6 +1059,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "number_prefix"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
+
 [[package]]
 name = "object"
 version = "0.32.1"
@@ -1147,6 +1196,12 @@ version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
+[[package]]
+name = "portable-atomic"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7170ef9988bc169ba16dd36a7fa041e5c4cbeb6a35b76d4c03daded371eae7c0"
+
 [[package]]
 name = "powerfmt"
 version = "0.2.0"
@@ -1883,6 +1938,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e51733f11c9c4f72aa0c160008246859e340b00807569a0da0e7a1079b27ba85"
+
 [[package]]
 name = "url"
 version = "2.5.0"
@@ -2062,6 +2123,15 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
+ "windows-targets 0.42.2",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
@@ -2080,6 +2150,21 @@ dependencies = [
  "windows-targets 0.52.0",
 ]
 
+[[package]]
+name = "windows-targets"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+dependencies = [
+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
@@ -2110,6 +2195,12 @@ dependencies = [
  "windows_x86_64_msvc 0.52.0",
 ]
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.48.5"
@@ -2122,6 +2213,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cb7764e35d4db8a7921e09562a0304bf2f93e0a51bfccee0bd0bb0b666b015ea"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
@@ -2134,6 +2231,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbaa0368d4f1d2aaefc55b6fcfee13f41544ddf36801e793edbbfd7d7df075ef"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
@@ -2146,6 +2249,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
@@ -2158,6 +2267,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
@@ -2170,6 +2285,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
@@ -2182,6 +2303,12 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
diff --git a/Cargo.toml b/Cargo.toml
index 46e59a8..c682ad9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,6 +28,8 @@ itertools = "0.12"
 derive_builder = "0.12.0"
 rayon = "1.8.0"
 static_init = "1.0.3"
+grid = { version = "0.12.0", features = ["std", "serde"] }
+indicatif = "0.17.7"
 
 [features]
 part1 = []
diff --git a/src/bin/template.rs b/src/bin/template.rs
index bb8887e..fe57dcb 100644
--- a/src/bin/template.rs
+++ b/src/bin/template.rs
@@ -23,7 +23,7 @@ fn part1(input: String) -> Result<usize> {
 
     // algo
     let a_start = Instant::now();
-    let answer = 0;
+    let mut answer = 0;
     let algo_time = a_start.elapsed();
 
     // output
@@ -42,7 +42,7 @@ fn part2(input: String) -> Result<usize> {
 
     // algo
     let a_start = Instant::now();
-    let answer = 0;
+    let mut answer = 0;
     let algo_time = a_start.elapsed();
 
     // output
diff --git a/src/bin/test.rs b/src/bin/test.rs
index 8b13789..2bb5fb6 100644
--- a/src/bin/test.rs
+++ b/src/bin/test.rs
@@ -1 +1,38 @@
+use aoc23::prelude::*;
 
+#[derive(Debug, Clone)]
+enum Tile {
+    None,
+    Round,
+    Square,
+}
+
+fn get_columns<'a>(matrix: &'a mut Vec<Vec<Tile>>) -> Vec<Vec<&'a mut Tile>> {
+    let mut columns = vec![];
+    let cols = matrix.first().map_or(0, Vec::len);
+    let rows = matrix.len();
+    for col_idx in 0..cols {
+        let mut column = vec![];
+        for row_idx in 0..rows {
+            column.push(&mut matrix[row_idx][col_idx]);
+        }
+        columns.push(column);
+    }
+    columns
+}
+
+fn tilt(rocks: &mut Vec<&mut Tile>) {
+    for rock in rocks.iter_mut() {
+        **rock = Tile::Round;
+    }
+}
+
+fn main() -> Result<()> {
+    // 10 x 10 grid of None
+    let mut matrix: Vec<Vec<Tile>> = vec![vec![Tile::None; 10]; 10];
+    println!("BEFORE:\n{:?}", matrix);
+    let mut columns = get_columns(&mut matrix);
+    tilt(columns.get_mut(0).unwrap());
+    println!("AFTER:\n{:?}", matrix);
+    Ok(())
+}