diff --git a/day15/input b/day15/input
new file mode 100644
index 0000000..6281182
--- /dev/null
+++ b/day15/input
@@ -0,0 +1,4 @@
+Sprinkles: capacity 5, durability -1, flavor 0, texture 0, calories 5
+PeanutButter: capacity -1, durability 3, flavor 0, texture 0, calories 1
+Frosting: capacity 0, durability -1, flavor 4, texture 0, calories 6
+Sugar: capacity -1, durability 0, flavor 0, texture 2, calories 8
diff --git a/day15/solution.rb b/day15/solution.rb
new file mode 100644
index 0000000..ba25635
--- /dev/null
+++ b/day15/solution.rb
@@ -0,0 +1,38 @@
+#!/bin/env ruby
+require 'pry'
+input = File.readlines('./input').map(&:chomp)
+
+ingredients = input.to_h do |line|
+  line = line.delete(':').delete(',').split
+  ingredient = line[0].to_sym
+  properties = line[1..-1].each_slice(2).map { |property, num| [property.to_sym, num.to_i] }.to_h
+  [ingredient, properties]
+end
+sets = []
+100.times { |a| 100.times { |b| 100.times { |c| 100.times { |d| sets.push([a, b, c, d]) if a + b + c + d == 100 } } } }
+totals = []
+properties = ingredients.values[0].keys
+properties.delete(:calories)
+
+scores = []
+sets.each.with_index do |set, _i|
+  p_scores = properties.map do |property|
+    ingredients.values.map { |hash| hash[property] }.zip(set).map { |pair| pair.reduce(&:*) }.sum
+  end
+  p_scores.map! { |score| score < 0 ? 0 : score }
+  scores.push(p_scores.reduce(&:*))
+end
+
+puts "Part 1 Solution: #{scores.max}."
+# part 2
+scores = []
+sets.each.with_index do |set, _i|
+  next unless ingredients.values.map { |hash| hash[:calories] }.zip(set).map { |pair| pair.reduce(&:*) }.sum == 500
+
+  p_scores = properties.map do |property|
+    ingredients.values.map { |hash| hash[property] }.zip(set).map { |pair| pair.reduce(&:*) }.sum
+  end
+  p_scores.map! { |score| score < 0 ? 0 : score }
+  scores.push(p_scores.reduce(&:*))
+end
+puts "Part 2 Solution: #{scores.max}."