diff --git a/d04/main.odin b/d04/main.odin
new file mode 100644
index 0000000..5525fed
--- /dev/null
+++ b/d04/main.odin
@@ -0,0 +1,161 @@
+package main
+
+import "core:math"
+import "core:slice"
+import "core:strconv"
+import "core:strings"
+import "core:bytes"
+import "core:fmt"
+import "core:os"
+
+import "../util"
+
+map_batch :: proc(batch: []string) -> map[string]string {
+    batch_map := make(map[string]string)
+    for line in batch {
+        parts := strings.split(line, " ")
+        for part in parts {
+            entry := strings.split(part, ":")
+            batch_map[entry[0]] = entry[1]
+        }
+    }
+
+    return batch_map
+}
+
+EXPECTED_FIELDS :: []string{
+    "byr",
+    "iyr",
+    "eyr",
+    "hgt",
+    "hcl",
+    "ecl",
+    "pid",
+}
+
+part_1 :: proc(lines: []string) {
+    result := 0
+
+    batches := make([dynamic]map[string]string) 
+    batch: []string
+
+    batch_idx := 0
+    for line, idx in lines {
+        if len(line) == 0 {
+            batch := lines[batch_idx:idx]
+            append(&batches, map_batch(batch))
+            batch_idx = idx + 1
+        }
+    }
+
+    batch_loop: for batch in batches {
+        for field in EXPECTED_FIELDS {
+            _, ok := batch[field]
+            if !ok do continue batch_loop 
+        }
+
+        result += 1
+    }
+
+    fmt.printfln("Part 1: %d", result)
+}
+
+part_2 :: proc(lines: []string) {
+    result := 0
+
+    batches := make([dynamic]map[string]string) 
+    batch: []string
+
+    batch_idx := 0
+    for line, idx in lines {
+        if len(line) == 0 {
+            batch := lines[batch_idx:idx]
+            append(&batches, map_batch(batch))
+            batch_idx = idx + 1
+        }
+    }
+
+    batch_loop: for batch in batches {
+        for field in EXPECTED_FIELDS {
+            val, ok := batch[field]
+            if !ok do continue batch_loop 
+
+            switch field {
+            case "byr": 
+                if len(val) != 4 do continue batch_loop 
+                year, ok := strconv.parse_int(val); assert(ok)
+                if year < 1920 || year > 2002 do continue batch_loop
+
+            case "iyr": 
+                if len(val) != 4 do continue batch_loop 
+                year, ok := strconv.parse_int(val); assert(ok)
+                if year < 2010 || year > 2020 do continue batch_loop
+
+            case "eyr":
+                if len(val) != 4 do continue batch_loop 
+                year, ok := strconv.parse_int(val); assert(ok)
+                if year < 2020 || year > 2030 do continue batch_loop
+
+            case "hgt":
+                if len(val) < 3 do continue batch_loop
+                unit := val[len(val)-2:]
+                length, ok := strconv.parse_int(val[:len(val)-2]); assert(ok)
+                switch unit {
+                case "cm":
+                    if length < 150 || length > 193 do continue batch_loop
+                case "in":
+                    if length < 59 || length > 76 do continue batch_loop
+                case: continue batch_loop
+                }
+
+            case "hcl":
+                if len(val) != 7 do continue batch_loop
+                if val[0] != '#' do continue batch_loop
+                for letter in val[1:] {
+                    switch letter { 
+                    case '0'..='9': continue
+                    case 'a'..='f': continue
+                    case: continue batch_loop
+                    }
+                }
+
+            case "ecl":
+                EXPECTED_COLORS :: []string{
+                    "amb",
+                    "blu",
+                    "brn",
+                    "gry",
+                    "grn",
+                    "hzl",
+                    "oth",
+                }
+                if !slice.contains(EXPECTED_COLORS, val) do continue batch_loop
+
+            case "pid":
+                if len(val) != 9 do continue batch_loop
+                for letter in val {
+                    switch letter { 
+                    case '0'..='9': continue
+                    case: continue batch_loop
+                    }
+                }
+            }
+        }
+
+        result += 1
+    }
+
+    fmt.printfln("Part 2: %d", result)
+}
+
+main :: proc() {
+    context.allocator = context.temp_allocator
+    defer free_all(context.temp_allocator)
+
+    INPUT :: #load("input.txt", string)
+    lines := strings.split(INPUT, "\n")
+    lines = lines[:len(lines)-1]
+
+    part_1(lines)
+    part_2(lines)
+}