diff --git a/day-03/Makefile b/day-03/Makefile
new file mode 100644
index 0000000..4ffd562
--- /dev/null
+++ b/day-03/Makefile
@@ -0,0 +1,40 @@
+CC=gcc
+CFLAGS=-Wall
+
+all: clean bin/part01 bin/part02
+ @echo "built all"
+
+run1: clean bin/part01
+ cat data/p01data.txt | bin/part01
+
+run2: clean bin/part02
+ cat data/p02data.txt | bin/part02
+
+test1: clean bin/part01
+ cat data/p01test.txt | bin/part01
+
+test2: clean bin/part02
+ cat data/p02test.txt | bin/part02
+
+bin/part01:
+ $(CC) src/part01.c -o bin/part01
+
+bin/part02:
+ $(CC) src/part02.c -o bin/part02
+
+.PHONY: clean,pytest1,pytest2,pyrun1,pyrun2
+
+clean:
+ rm -f bin/*
+
+pytest1:
+ cat data/p01test.txt | python3 src/part01.py
+
+pyrun1:
+ cat data/p01data.txt | python3 src/part01.py
+
+pytest2:
+ cat data/p02test.txt | python3 src/part02.py
+
+pyrun2:
+ cat data/p02data.txt | python3 src/part02.py
\ No newline at end of file
diff --git a/day-03/README.md b/day-03/README.md
new file mode 100644
index 0000000..3c0ca4d
--- /dev/null
+++ b/day-03/README.md
@@ -0,0 +1,81 @@
+# Day 3: Gear Ratios
+https://adventofcode.com/2023/day/3
+
+You and the Elf eventually reach a gondola lift station; he says the gondola lift will take you up to the water source, but this is as far as he can bring you. You go inside.
+
+It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
+
+"Aaah!"
+
+You turn around to see a slightly-greasy Elf with a wrench and a look of surprise. "Sorry, I wasn't expecting anyone! The gondola lift isn't working right now; it'll still be a while before I can fix it." You offer to help.
+
+The engineer explains that an engine part seems to be missing from the engine, but nobody can figure out which one. If you can **add up all the part numbers** in the engine schematic, it should be easy to work out which part is missing.
+
+The engine schematic (your puzzle input) consists of a visual representation of the engine. There are lots of numbers and symbols you don't really understand, but apparently **any number adjacent to a symbol**, even diagonally, is a "part number" and should be included in your sum. (Periods (`.`) do not count as a symbol.)
+
+Here is an example engine schematic:
+```
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
+```
+
+In this schematic, two numbers are **not** part numbers because they are not adjacent to a symbol: `114` (top right) and `58` (middle right). Every other number is adjacent to a symbol and so is a part number; their sum is **`4361`**.
+
+Of course, the actual engine schematic is much larger. What is the sum of all of the part numbers in the engine schematic?
+
+What is the sum of all of the part numbers in the engine schematic?
+
+
+Your puzzle answer was 509115.
+
+The first half of this puzzle is complete! It provides one gold star: *
+
+What is the sum of all of the gear ratios in your engine schematic?
+
+
+Your puzzle answer was XXXXX.
+
+Both parts of this puzzle are complete! They provide two gold stars: **
+
+