diff --git a/03.bowling/bowling_score.rb b/03.bowling/bowling_score.rb
new file mode 100755
index 0000000000..0585e6d39c
--- /dev/null
+++ b/03.bowling/bowling_score.rb
@@ -0,0 +1,31 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+frame = 1
+throw = 1
+
+score_list = ARGV[0].split(',')
+score_list = score_list.map { |score| score == 'X' ? 10 : score.to_i }
+
+total = score_list.each_with_index.sum do |score, index|
+  next score if frame == 10
+
+  score_group = score_list[index, 3]
+  if throw == 1
+    if score_group[0] == 10 # ストライク判定
+      add_score = score_group[1..2].sum
+      frame += 1
+    else
+      add_score = (score_group[0..1].sum == 10 ? score_group[2] : 0) # スペアかそうでないか判定
+      throw = 2
+    end
+  else
+    add_score = 0
+    frame += 1
+    throw = 1
+  end
+
+  add_score + score
+end
+
+puts total
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000000..ca5fb3ba31
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org" # rubocop:disable Style/StringLiterals
+
+group :development do
+  gem 'rubocop-fjord', require: false
+end
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000000..8fb80dc032
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,45 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
+    racc (1.7.3)
+    rainbow (3.1.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
+    rubocop (1.63.5)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-fjord (0.3.0)
+      rubocop (>= 1.0)
+      rubocop-performance
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (2.5.0)
+
+PLATFORMS
+  arm64-darwin-22
+  ruby
+
+DEPENDENCIES
+  rubocop-fjord
+
+BUNDLED WITH
+   2.5.9