diff --git a/day-03/benchmark b/day-03/benchmark
new file mode 100644
index 0000000..466e477
--- /dev/null
+++ b/day-03/benchmark
@@ -0,0 +1,15 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-03
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkMain-12    	1000000000	         0.001213 ns/op
+BenchmarkMain-12    	1000000000	         0.001343 ns/op
+BenchmarkMain-12    	1000000000	         0.001210 ns/op
+BenchmarkMain-12    	1000000000	         0.001314 ns/op
+BenchmarkMain-12    	1000000000	         0.001288 ns/op
+BenchmarkMain-12    	1000000000	         0.001646 ns/op
+BenchmarkMain-12    	1000000000	         0.001211 ns/op
+BenchmarkMain-12    	1000000000	         0.001174 ns/op
+BenchmarkMain-12    	1000000000	         0.001220 ns/op
+BenchmarkMain-12    	1000000000	         0.001169 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-03	0.104s
diff --git a/day-03/cmd/cli/main.go b/day-03/cmd/cli/main.go
new file mode 100644
index 0000000..e6acdd0
--- /dev/null
+++ b/day-03/cmd/cli/main.go
@@ -0,0 +1,41 @@
+/********************************************************************************
+    Advent of Code 2024 - day-03
+********************************************************************************/
+
+package main
+
+import (
+	"embed"
+	"flag"
+	"fmt"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	problems "github.com/onyx-and-iris/aoc2024/day-03"
+)
+
+//go:embed testdata
+var files embed.FS
+
+func main() {
+	filename := flag.String("f", "input.txt", "input file")
+	loglevel := flag.Int("l", int(log.InfoLevel), "log level (shorthand)")
+	flag.Parse()
+
+	if slices.Contains(log.AllLevels, log.Level(*loglevel)) {
+		log.SetLevel(log.Level(*loglevel))
+	}
+
+	data, err := files.ReadFile(fmt.Sprintf("testdata/%s", *filename))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	one, two, err := problems.Solve(data)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("solution one: %d\nsolution two: %d\n", one, two)
+}
diff --git a/day-03/go.mod b/day-03/go.mod
new file mode 100644
index 0000000..c9bd4ac
--- /dev/null
+++ b/day-03/go.mod
@@ -0,0 +1,7 @@
+module github.com/onyx-and-iris/aoc2024/day-03
+
+go 1.23.3
+
+require github.com/sirupsen/logrus v1.9.3
+
+require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
diff --git a/day-03/go.sum b/day-03/go.sum
new file mode 100644
index 0000000..21f9bfb
--- /dev/null
+++ b/day-03/go.sum
@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/day-03/internal/one/benchmark b/day-03/internal/one/benchmark
new file mode 100644
index 0000000..647e40e
--- /dev/null
+++ b/day-03/internal/one/benchmark
@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-03/internal/one
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkMain-12    	1000000000	         0.0006976 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-03/internal/one	0.010s
diff --git a/day-03/internal/one/solve.go b/day-03/internal/one/solve.go
new file mode 100644
index 0000000..ed6824c
--- /dev/null
+++ b/day-03/internal/one/solve.go
@@ -0,0 +1,41 @@
+package one
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"regexp"
+
+	"github.com/onyx-and-iris/aoc2024/day-03/internal/util"
+)
+
+var reMul = regexp.MustCompile(`mul\((?P<first>[0-9]{1,3}),(?P<second>[0-9]{1,3})\)`)
+
+func Solve(data []byte) (int, error) {
+	r := bytes.NewReader(data)
+	sum, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}
+
+func parseLines(r io.Reader) (int, error) {
+	var sum int
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		m := reMul.FindAllString(scanner.Text(), -1)
+		for _, v := range m {
+			groups := util.GetGroups(reMul, v)
+			sum += util.MustConv(groups["first"]) * util.MustConv(groups["second"])
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}
diff --git a/day-03/internal/one/solve_internal_test.go b/day-03/internal/one/solve_internal_test.go
new file mode 100644
index 0000000..f9cc9af
--- /dev/null
+++ b/day-03/internal/one/solve_internal_test.go
@@ -0,0 +1,15 @@
+package one
+
+import (
+	_ "embed"
+	"os"
+	"testing"
+)
+
+//go:embed testdata/input.txt
+var data []byte
+
+func BenchmarkMain(b *testing.B) {
+	os.Stdout, _ = os.Open(os.DevNull)
+	Solve(data)
+}
diff --git a/day-03/internal/two/benchmark b/day-03/internal/two/benchmark
new file mode 100644
index 0000000..bcd5649
--- /dev/null
+++ b/day-03/internal/two/benchmark
@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-03/internal/two
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkMain-12    	1000000000	         0.0006480 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-03/internal/two	0.010s
diff --git a/day-03/internal/two/solve.go b/day-03/internal/two/solve.go
new file mode 100644
index 0000000..c3132a4
--- /dev/null
+++ b/day-03/internal/two/solve.go
@@ -0,0 +1,58 @@
+package two
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"regexp"
+
+	"github.com/onyx-and-iris/aoc2024/day-03/internal/util"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var reMulOrDoOrDont = regexp.MustCompile(`mul\((?P<first>[0-9]{1,3}),(?P<second>[0-9]{1,3})\)|do\(\)|don't\(\)`)
+
+func Solve(data []byte) (int, error) {
+	r := bytes.NewReader(data)
+	sum, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}
+
+func parseLines(r io.Reader) (int, error) {
+	var sum int
+	var do bool = true
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		m := reMulOrDoOrDont.FindAllString(scanner.Text(), -1)
+		for _, v := range m {
+			switch v {
+			case "do()":
+				do = true
+				log.Debug("hit a do")
+			case "don't()":
+				do = false
+				log.Debug("hit a don't")
+			}
+
+			if do {
+				groups := util.GetGroups(reMulOrDoOrDont, v)
+				if groups["first"] != "" && groups["second"] != "" {
+					log.Debugf("%s * %s\n", groups["first"], groups["second"])
+					sum += util.MustConv(groups["first"]) * util.MustConv(groups["second"])
+				}
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}
diff --git a/day-03/internal/two/solve_internal_test.go b/day-03/internal/two/solve_internal_test.go
new file mode 100644
index 0000000..e3efa34
--- /dev/null
+++ b/day-03/internal/two/solve_internal_test.go
@@ -0,0 +1,15 @@
+package two
+
+import (
+	_ "embed"
+	"os"
+	"testing"
+)
+
+//go:embed testdata/input.txt
+var data []byte
+
+func BenchmarkMain(b *testing.B) {
+	os.Stdout, _ = os.Open(os.DevNull)
+	Solve(data)
+}
diff --git a/day-03/internal/util/util.go b/day-03/internal/util/util.go
new file mode 100644
index 0000000..35c11e3
--- /dev/null
+++ b/day-03/internal/util/util.go
@@ -0,0 +1,25 @@
+package util
+
+import (
+	"regexp"
+	"strconv"
+)
+
+func GetGroups(r *regexp.Regexp, s string) map[string]string {
+	groups := make(map[string]string)
+	names := r.SubexpNames()
+	for i, res := range r.FindStringSubmatch(s) {
+		if i != 0 {
+			groups[names[i]] = res
+		}
+	}
+	return groups
+}
+
+func MustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
diff --git a/day-03/makefile b/day-03/makefile
new file mode 100644
index 0000000..88e5cc7
--- /dev/null
+++ b/day-03/makefile
@@ -0,0 +1,30 @@
+program = day-03
+
+GO = go
+SRC_DIR := src
+BIN_DIR := bin
+
+EXE := $(BIN_DIR)/$(program)
+
+.DEFAULT_GOAL := build
+
+.PHONY: fmt vet build bench clean
+fmt:        
+	$(GO) fmt ./...
+
+vet: fmt        
+	$(GO) vet ./...
+
+build: vet | $(BIN_DIR)
+	$(GO) build -o $(EXE) ./$(SRC_DIR)
+
+bench:
+	$(GO) test ./internal/one/ -bench=. > internal/one/benchmark
+	$(GO) test ./internal/two/ -bench=. > internal/two/benchmark
+	$(GO) test . -count=10 -bench=. > benchmark
+
+$(BIN_DIR):
+	@mkdir -p $@
+
+clean:
+	@rm -rv $(BIN_DIR)
diff --git a/day-03/solve.go b/day-03/solve.go
new file mode 100644
index 0000000..3a3dd39
--- /dev/null
+++ b/day-03/solve.go
@@ -0,0 +1,20 @@
+package daythree
+
+import (
+	"github.com/onyx-and-iris/aoc2024/day-03/internal/one"
+	"github.com/onyx-and-iris/aoc2024/day-03/internal/two"
+)
+
+func Solve(data []byte) (int, int, error) {
+	answerOne, err := one.Solve(data)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	answerTwo, err := two.Solve(data)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return answerOne, answerTwo, nil
+}
diff --git a/day-03/solve_internal_test.go b/day-03/solve_internal_test.go
new file mode 100644
index 0000000..98f962c
--- /dev/null
+++ b/day-03/solve_internal_test.go
@@ -0,0 +1,15 @@
+package daythree
+
+import (
+	_ "embed"
+	"os"
+	"testing"
+)
+
+//go:embed testdata/input.txt
+var data []byte
+
+func BenchmarkMain(b *testing.B) {
+	os.Stdout, _ = os.Open(os.DevNull)
+	Solve(data)
+}