diff --git a/2023/02/README.md b/2023/02/README.md
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+## \-\-\- Day 2: Cube Conundrum ---
+
+You're launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a large island floating in the sky. You gently land in a fluffy pile of leaves. It's quite cold, but you don't see much snow. An Elf runs over to greet you.
+
+The Elf explains that you've arrived at _Snow Island_ and apologizes for the lack of snow. He'll be happy to explain the situation, but it's a bit of a walk, so you have some time. They don't get many visitors up here; would you like to play a game in the meantime?
+
+As you walk, the Elf shows you a small bag and some cubes which are either red, green, or blue. Each time you play this game, he will hide a secret number of cubes of each color in the bag, and your goal is to figure out information about the number of cubes.
+
+To get information, once a bag has been loaded with cubes, the Elf will reach into the bag, grab a handful of random cubes, show them to you, and then put them back in the bag. He'll do this a few times per game.
+
+You play several games and record the information from each game (your puzzle input). Each game is listed with its ID number (like the `11` in `Game 11: ...`) followed by a semicolon-separated list of subsets of cubes that were revealed from the bag (like `3 red, 5 green, 4 blue`).
+
+For example, the record of a few games might look like this:
+
+```
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+
+```
+
+In game 1, three sets of cubes are revealed from the bag (and then put back again). The first set is 3 blue cubes and 4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the third set is only 2 green cubes.
+
+The Elf would first like to know which games would have been possible if the bag contained _only 12 red cubes, 13 green cubes, and 14 blue cubes_?
+
+In the example above, games 1, 2, and 5 would have been _possible_ if the bag had been loaded with that configuration. However, game 3 would have been _impossible_ because at one point the Elf showed you 20 red cubes at once; similarly, game 4 would also have been _impossible_ because the Elf showed you 15 blue cubes at once. If you add up the IDs of the games that would have been possible, you get `8`.
+
+Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes, and 14 blue cubes. _What is the sum of the IDs of those games?_
\ No newline at end of file
diff --git a/2023/02/code.go b/2023/02/code.go
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index 0000000..999ffc3
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+++ b/2023/02/code.go
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+package main
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/jpillora/puzzler/harness/aoc"
+)
+
+func main() {
+	aoc.Harness(run)
+}
+
+// on code change, run will be executed 4 times:
+// 1. with: false (part1), and example input
+// 2. with: true (part2), and example input
+// 3. with: false (part1), and user input
+// 4. with: true (part2), and user input
+// the return value of each run is printed to stdout
+func run(part2 bool, input string) any {
+	// when you're ready to do part 2, remove this "not implemented" block
+	if part2 {
+		return "not implemented"
+	}
+	// solve part 1 here
+
+	redMax := 12
+	greenMax := 13
+	blueMax := 14
+	sum := 0
+
+	gameIdRxp := regexp.MustCompile(`Game (?P<ID>\d+):(?P<Data>.*)`)
+
+	for _, line := range strings.Split(input, "\n") {
+
+		matches := gameIdRxp.FindStringSubmatch(line)
+		if len(matches) == 0 {
+			continue
+		}
+
+		id, _ := strconv.Atoi(matches[1])
+		data := matches[2]
+
+		valid := true
+	drawLoop:
+		for _, draw := range strings.Split(data, ";") {
+			redDraw := 0
+			greenDraw := 0
+			blueDraw := 0
+
+			for _, single := range strings.Split(strings.Trim(draw, " "), ",") {
+				split := strings.Split(strings.Trim(single, " "), " ")
+
+				count, _ := strconv.Atoi(strings.Trim(split[0], " "))
+				colour := split[1]
+
+				if colour == "red" {
+					redDraw += count
+				} else if colour == "blue" {
+					blueDraw += count
+				} else if colour == "green" {
+					greenDraw += count
+				}
+
+				if redDraw > redMax || blueDraw > blueMax || greenDraw > greenMax {
+					valid = false
+					break drawLoop
+				}
+			}
+		}
+
+		if valid {
+			sum += id
+		}
+
+	}
+
+	return sum
+}
diff --git a/2023/02/input-example.txt b/2023/02/input-example.txt
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+++ b/2023/02/input-example.txt
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+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
diff --git a/2023/02/input-user.txt b/2023/02/input-user.txt
new file mode 100644
index 0000000..249bfe4
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+++ b/2023/02/input-user.txt
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+Game 1: 18 red, 8 green, 7 blue; 15 red, 4 blue, 1 green; 2 green, 17 red, 6 blue; 5 green, 1 blue, 11 red; 18 red, 1 green, 14 blue; 8 blue
+Game 2: 16 blue, 12 green, 3 red; 13 blue, 2 red, 8 green; 15 green, 3 red, 16 blue
+Game 3: 6 green, 15 red; 1 green, 4 red, 7 blue; 9 blue, 7 red, 8 green
+Game 4: 8 red, 2 blue; 11 red, 5 blue, 1 green; 12 red, 1 green, 5 blue; 1 blue; 2 blue, 9 red
+Game 5: 9 blue, 3 red, 12 green; 3 green, 4 red, 17 blue; 15 blue, 2 green, 5 red; 3 blue, 5 green, 6 red; 6 red, 4 blue, 7 green; 3 green, 10 blue
+Game 6: 11 red, 2 blue, 6 green; 2 blue, 9 red, 4 green; 3 blue, 12 red, 8 green; 5 red, 11 green, 4 blue; 2 blue, 9 red, 13 green; 15 red, 3 blue, 7 green
+Game 7: 2 red, 9 green, 12 blue; 14 blue, 1 green, 6 red; 7 blue, 9 green; 9 green, 8 red, 4 blue; 5 red, 3 green, 16 blue; 4 red, 8 green
+Game 8: 11 red, 12 green, 1 blue; 4 red, 7 green; 11 red, 6 green; 17 green; 15 green, 1 red
+Game 9: 1 red, 1 green, 12 blue; 3 green, 12 red, 6 blue; 14 red, 1 blue; 9 blue, 1 red, 3 green
+Game 10: 1 red, 4 blue; 3 blue, 4 green; 3 green, 3 red, 8 blue; 2 blue, 3 red; 3 green, 4 red, 3 blue
+Game 11: 8 blue, 1 red; 8 green, 1 red, 1 blue; 13 green, 9 red, 6 blue
+Game 12: 2 red, 2 blue, 1 green; 3 red, 1 green; 1 blue, 3 green
+Game 13: 12 green, 4 blue; 2 red, 2 blue, 8 green; 6 green, 3 red; 3 red, 5 green; 9 green, 7 blue, 1 red
+Game 14: 1 red, 7 green; 5 green, 12 red, 10 blue; 9 red, 11 blue, 7 green; 7 blue, 3 red, 9 green
+Game 15: 7 green, 1 blue; 1 red, 2 green, 1 blue; 7 green
+Game 16: 1 green, 1 blue; 2 blue, 4 green, 2 red; 2 green, 2 blue
+Game 17: 6 red, 11 green, 7 blue; 1 blue, 13 green, 4 red; 4 green, 6 blue, 7 red
+Game 18: 2 red, 8 blue; 7 red, 11 blue; 1 green, 16 blue, 7 red; 18 blue, 1 green, 14 red
+Game 19: 2 red, 2 blue; 1 green, 6 red; 1 green, 3 red, 2 blue
+Game 20: 6 red, 2 blue, 5 green; 4 red, 1 blue, 9 green; 3 blue, 2 red, 9 green; 8 red, 12 green, 5 blue
+Game 21: 6 red, 7 blue; 3 blue, 16 red, 2 green; 2 blue, 13 red; 3 blue, 11 red, 3 green; 1 green, 18 red, 6 blue; 12 red, 5 blue, 2 green
+Game 22: 9 red, 6 blue, 14 green; 1 blue, 5 green, 13 red; 6 red; 18 red, 4 green; 2 blue, 10 green, 16 red; 1 red, 18 green, 1 blue
+Game 23: 6 green, 4 red, 3 blue; 1 blue, 2 red, 9 green; 5 green, 1 red, 3 blue; 5 blue, 4 red, 4 green
+Game 24: 1 red, 5 green, 2 blue; 4 red, 7 green, 9 blue; 9 blue, 7 green; 7 green, 13 blue; 4 blue, 1 green, 4 red
+Game 25: 13 blue, 10 red, 11 green; 10 green, 1 blue, 3 red; 15 red, 5 green, 8 blue; 19 red, 10 green, 13 blue; 12 blue, 4 green, 16 red; 7 red, 5 green, 9 blue
+Game 26: 20 red, 6 blue, 12 green; 15 blue, 17 red, 9 green; 19 red, 6 green, 3 blue; 8 green, 1 red, 15 blue; 10 green, 8 red, 5 blue; 4 green, 20 red, 18 blue
+Game 27: 2 blue, 3 green, 7 red; 2 blue, 4 red; 5 blue, 5 green; 8 blue, 6 green, 2 red
+Game 28: 1 green, 6 red; 3 red, 3 blue; 1 green, 4 red; 1 red, 2 blue; 2 red
+Game 29: 8 blue, 1 green; 7 blue, 1 red; 6 red, 2 blue; 2 red, 3 green; 3 red, 6 green, 5 blue
+Game 30: 11 blue, 17 green, 10 red; 9 blue, 12 green, 14 red; 16 green, 2 red, 8 blue; 18 green, 1 red, 1 blue; 5 blue, 7 red, 18 green; 9 green, 3 blue, 11 red
+Game 31: 5 blue, 13 green; 2 green, 3 red, 4 blue; 3 red, 15 green, 2 blue; 5 blue, 19 green; 5 blue, 18 green; 3 green, 7 blue, 3 red
+Game 32: 12 red, 2 green, 3 blue; 2 green, 16 red, 1 blue; 13 red, 4 green, 6 blue
+Game 33: 18 green, 8 blue, 3 red; 15 green, 2 blue, 4 red; 14 blue, 3 red, 6 green; 20 green, 13 blue; 1 red, 19 green
+Game 34: 1 green, 7 blue, 2 red; 8 green, 10 blue, 2 red; 3 blue, 1 green, 1 red; 6 green, 13 blue, 1 red; 1 green, 4 blue, 2 red; 1 red, 5 green, 7 blue
+Game 35: 7 blue, 8 red; 2 blue, 3 red; 4 blue, 3 red; 7 red, 4 blue; 1 blue, 1 green, 3 red
+Game 36: 1 red, 8 green; 1 red, 6 green; 3 green, 8 red; 1 blue, 2 red, 1 green
+Game 37: 3 blue, 13 red; 2 blue, 7 red; 5 red, 1 green; 3 red, 3 blue; 1 blue, 12 red, 1 green; 14 red, 3 blue
+Game 38: 7 blue, 18 red, 12 green; 11 red, 6 green, 1 blue; 9 green, 1 red; 9 green, 13 blue, 16 red
+Game 39: 12 red, 3 green, 2 blue; 3 blue, 3 green, 10 red; 2 blue, 5 red; 2 blue, 1 green; 5 blue, 4 green, 7 red; 2 green, 1 red
+Game 40: 1 red, 7 blue, 5 green; 1 red, 4 blue, 8 green; 3 red, 5 blue, 14 green; 10 green, 2 blue, 1 red; 11 blue, 7 green, 1 red; 14 green, 2 blue
+Game 41: 8 green, 5 red, 3 blue; 5 red, 4 blue, 12 green; 10 green, 6 blue; 13 green, 7 blue; 1 red, 2 green, 15 blue
+Game 42: 17 red, 1 blue, 5 green; 9 green, 16 red; 1 blue, 15 green, 2 red; 1 blue, 12 red, 12 green
+Game 43: 12 green, 5 blue; 3 red, 8 blue, 10 green; 8 blue, 2 green, 1 red
+Game 44: 1 green, 7 red, 2 blue; 1 blue, 10 red; 4 green, 3 blue, 19 red; 1 blue, 3 green, 1 red; 1 blue; 4 red, 2 green, 3 blue
+Game 45: 16 red, 12 blue, 1 green; 13 blue, 16 red, 9 green; 7 green, 3 red, 8 blue
+Game 46: 1 red, 17 green, 6 blue; 6 blue, 1 red, 3 green; 12 green, 1 blue; 4 blue, 2 green
+Game 47: 2 green, 12 red, 15 blue; 9 blue, 2 green, 2 red; 3 green, 6 blue, 2 red; 11 blue, 3 green, 5 red; 6 green, 9 red, 17 blue
+Game 48: 5 blue, 6 red; 7 green, 14 red, 4 blue; 2 green, 5 blue, 2 red; 11 blue, 5 red, 5 green
+Game 49: 7 green, 7 blue, 4 red; 11 green, 12 blue, 2 red; 12 blue, 4 red, 9 green; 3 red, 8 blue, 17 green; 16 green, 3 red, 14 blue
+Game 50: 5 green, 4 red, 10 blue; 7 green, 14 red, 5 blue; 12 red, 18 blue, 14 green
+Game 51: 12 green, 3 blue; 10 green, 4 blue, 2 red; 3 green, 5 blue
+Game 52: 12 green, 6 red, 7 blue; 20 green, 6 red, 18 blue; 1 green, 5 blue, 11 red; 2 green, 15 blue, 6 red
+Game 53: 6 red, 2 green, 5 blue; 13 green, 1 blue, 14 red; 7 green, 1 blue; 3 green, 4 blue, 6 red; 10 red, 6 green, 4 blue
+Game 54: 4 blue, 1 red; 1 red, 1 blue, 9 green; 3 red, 2 blue, 4 green; 3 green, 2 red, 5 blue; 9 blue, 2 red, 7 green
+Game 55: 7 blue; 6 blue, 1 red; 4 red, 7 blue; 3 red, 3 blue, 1 green
+Game 56: 2 green, 7 blue; 3 red, 10 blue; 1 green, 2 red; 3 red, 8 blue, 4 green; 1 green, 11 blue, 3 red; 2 green, 8 blue
+Game 57: 3 red, 1 green; 1 green, 1 red, 1 blue; 1 red, 4 green, 15 blue; 9 blue, 2 red, 1 green
+Game 58: 12 blue, 13 red, 5 green; 2 blue, 6 green; 12 red, 15 green, 7 blue; 5 red, 4 green, 14 blue; 15 red, 2 green, 9 blue
+Game 59: 5 green, 5 blue; 4 red, 6 blue, 2 green; 5 blue, 3 green, 6 red; 3 red, 6 green, 4 blue; 3 blue, 7 green, 10 red
+Game 60: 1 red, 1 blue, 3 green; 1 red; 3 green, 6 blue; 6 blue
+Game 61: 7 green, 1 red, 1 blue; 4 red, 3 green, 1 blue; 7 blue, 7 green; 11 blue, 2 green, 5 red; 5 red, 4 green, 5 blue
+Game 62: 17 green, 2 red, 3 blue; 1 red, 3 blue, 2 green; 1 green, 3 blue, 2 red; 1 red, 17 green; 2 red, 15 green, 4 blue; 5 green
+Game 63: 2 green, 4 red, 3 blue; 9 blue, 10 red; 1 green, 13 blue, 2 red; 2 green, 1 blue, 5 red
+Game 64: 6 red, 8 blue; 3 red, 6 blue, 5 green; 13 red, 11 blue, 8 green; 11 red, 3 blue, 1 green
+Game 65: 4 green, 1 blue, 2 red; 3 blue, 3 green, 11 red; 6 green, 3 blue, 3 red; 5 red, 4 blue; 8 red, 5 blue, 2 green
+Game 66: 10 green, 13 red; 1 blue, 2 red, 4 green; 7 red, 7 green; 19 green, 9 red, 1 blue; 16 green, 16 red, 2 blue; 10 red, 11 green
+Game 67: 3 blue, 4 green, 2 red; 6 blue, 19 red; 4 blue, 2 red, 5 green; 4 green, 5 blue, 1 red
+Game 68: 13 blue, 15 red, 7 green; 5 blue, 20 red; 6 green, 12 blue, 8 red; 5 blue, 8 green
+Game 69: 13 red, 13 green; 13 green, 3 red, 1 blue; 8 green; 9 green, 9 red
+Game 70: 8 blue, 11 red, 2 green; 12 red, 2 blue; 13 red, 6 blue, 3 green; 7 blue, 3 green, 5 red; 15 red, 1 blue, 3 green
+Game 71: 7 red, 9 green; 4 blue, 9 green, 7 red; 4 blue, 2 green; 6 blue, 2 red, 9 green
+Game 72: 14 blue, 1 green; 4 red, 1 green, 9 blue; 6 blue, 8 red, 2 green
+Game 73: 17 green; 10 blue, 2 red, 9 green; 1 green, 10 blue, 2 red; 8 blue, 1 red; 5 blue, 16 green
+Game 74: 12 green, 6 red, 5 blue; 2 red, 4 blue, 10 green; 3 green, 4 blue, 2 red; 8 green, 2 red, 5 blue; 5 red, 2 blue, 2 green; 6 green, 1 red, 1 blue
+Game 75: 4 blue, 19 green; 15 blue, 7 green; 18 blue, 5 green, 7 red; 16 green, 15 blue; 7 red, 4 green, 13 blue; 9 green, 13 blue
+Game 76: 1 red, 2 green, 7 blue; 13 blue, 7 green, 1 red; 13 blue, 5 red
+Game 77: 3 red, 10 blue, 6 green; 1 green, 2 red, 10 blue; 7 green, 1 red
+Game 78: 11 green, 2 blue; 6 blue, 8 red, 5 green; 10 red, 6 green, 4 blue; 6 blue, 3 green, 10 red; 5 green, 6 red
+Game 79: 4 red, 6 blue, 1 green; 1 red; 2 green, 3 blue, 4 red; 4 red, 1 green, 2 blue; 2 green, 1 red
+Game 80: 2 red, 1 green; 1 red, 1 green; 7 red, 1 green; 1 blue, 7 red, 3 green
+Game 81: 1 blue, 15 red, 4 green; 2 green, 12 red; 4 green, 13 red; 1 blue, 3 green, 13 red; 12 red, 2 green, 1 blue; 3 green, 8 red, 1 blue
+Game 82: 18 red, 4 green, 1 blue; 14 red, 1 green, 2 blue; 10 red, 2 blue, 7 green; 13 red; 3 red, 7 green, 1 blue; 5 red, 4 green
+Game 83: 4 red, 10 green, 5 blue; 2 red, 12 blue, 13 green; 19 blue, 9 green, 1 red; 2 red, 14 blue, 3 green; 13 green, 8 blue, 5 red
+Game 84: 12 blue, 7 red, 9 green; 1 blue, 1 green, 14 red; 1 green, 8 red, 11 blue; 11 blue, 12 red, 3 green; 11 blue, 8 green, 13 red; 7 green, 7 red, 10 blue
+Game 85: 10 red, 2 blue; 11 green, 9 red, 4 blue; 3 red, 5 blue, 13 green; 5 red, 5 green; 5 red, 2 blue, 4 green; 11 green, 4 blue, 19 red
+Game 86: 1 blue, 6 green, 2 red; 1 red, 1 blue, 8 green; 3 red, 1 blue, 4 green; 1 green, 4 red; 9 green, 2 red; 6 green, 7 red, 1 blue
+Game 87: 8 green, 8 blue, 4 red; 5 red, 2 blue, 10 green; 3 red, 13 green; 1 red, 3 blue, 4 green
+Game 88: 3 blue, 9 green, 3 red; 2 blue, 15 green; 2 red, 9 green
+Game 89: 9 red, 6 green, 15 blue; 10 blue, 7 red, 2 green; 7 green, 16 blue, 4 red
+Game 90: 1 red, 1 blue, 7 green; 7 green, 1 blue, 8 red; 3 red, 1 blue, 1 green
+Game 91: 1 green, 2 red, 6 blue; 4 green, 4 red, 3 blue; 4 red, 11 green, 4 blue; 3 blue, 5 red; 8 green, 2 red, 8 blue
+Game 92: 2 red, 3 blue; 3 blue, 2 green, 2 red; 9 red, 3 green
+Game 93: 2 blue, 5 green; 2 green, 5 blue, 3 red; 2 green, 5 blue, 1 red; 7 blue, 4 red, 9 green
+Game 94: 1 red, 9 blue, 14 green; 6 green; 2 blue, 11 green; 4 blue, 16 green, 1 red
+Game 95: 10 green, 2 blue, 7 red; 4 blue, 4 red, 6 green; 3 red, 2 blue, 3 green
+Game 96: 12 red; 3 green, 10 red; 6 blue, 14 red, 2 green; 7 green, 15 red; 3 green, 3 red, 1 blue; 5 blue, 1 red
+Game 97: 3 red, 1 green, 1 blue; 1 green, 3 red; 4 red, 1 green
+Game 98: 4 red, 5 green, 6 blue; 2 red, 9 green, 6 blue; 2 blue, 11 red, 14 green; 6 green, 4 blue; 11 blue, 11 red, 8 green
+Game 99: 2 green, 20 blue; 12 blue; 3 red, 12 blue; 7 blue; 3 green, 10 blue, 2 red; 3 red, 2 green
+Game 100: 2 blue, 8 green, 12 red; 2 green, 13 red; 2 red, 4 green; 2 green, 7 red; 10 green, 5 red, 1 blue