diff --git a/.rspec b/.rspec
new file mode 100644
index 00000000..c99d2e73
--- /dev/null
+++ b/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 00000000..e9dfc3e6
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# gem "rails"
+
+gem 'rspec', '~> 3.12'
+
+gem 'rubocop', '~> 1.51'
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 00000000..b8760bf9
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,49 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    diff-lcs (1.5.0)
+    json (2.6.3)
+    parallel (1.23.0)
+    parser (3.2.2.1)
+      ast (~> 2.4.1)
+    rainbow (3.1.1)
+    regexp_parser (2.8.0)
+    rexml (3.2.5)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.0)
+    rubocop (1.51.0)
+      json (~> 2.3)
+      parallel (~> 1.10)
+      parser (>= 3.2.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.28.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.28.1)
+      parser (>= 3.2.1.0)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (2.4.2)
+
+PLATFORMS
+  x86_64-darwin-20
+
+DEPENDENCIES
+  rspec (~> 3.12)
+  rubocop (~> 1.51)
+
+BUNDLED WITH
+   2.4.13
diff --git a/app.rb b/app.rb
new file mode 100644
index 00000000..a7c909a4
--- /dev/null
+++ b/app.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require_relative './lib/bowling_score_sheet'
+
+class BowlingApp
+  def initialize(io, score_sheet)
+    @io = io
+    @score_sheet = score_sheet
+  end
+
+  def run
+    while @score_sheet.complete == false
+      @io.puts 'Enter number of knocked down pins separated by commas (eg 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1):'
+      user_input = @io.gets.chomp
+      roll(user_input)
+      print_score_sheet
+      @io.puts "Total: #{score}"
+    end
+  end
+
+  def roll(string_of_pins)
+    rolls = string_of_pins.split(',').map(&:to_i)
+    i = 0
+    while i < rolls.length
+      @score_sheet.add_roll(rolls[i])
+      i += 1
+    end
+  end
+
+  def score
+    @score_sheet.all_frames.sum do |frame|
+      frame.round <= 10 ? frame.total_score : 0
+    end
+  end
+
+  def print_score_sheet
+    @score_sheet.all_frames.each do |frame|
+      if frame.round.positive? && frame.round <= 10
+        @io.puts "Frame: #{frame.round}, scores: #{frame.score}, total score: #{frame.total_score}, notes: #{frame.status}"
+      end
+    end
+  end
+end
+
+if __FILE__ == $PROGRAM_NAME
+  app = BowlingApp.new(
+    Kernel,
+    BowlingScoreSheet.new
+  )
+  app.run
+end
diff --git a/lib/bowling_score_sheet.rb b/lib/bowling_score_sheet.rb
new file mode 100644
index 00000000..8dce9b2b
--- /dev/null
+++ b/lib/bowling_score_sheet.rb
@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+require_relative 'frame'
+
+class BowlingScoreSheet
+  def initialize
+    @frames = [Frame.new]
+  end
+
+  def add_roll(pins)
+    add_bonus_to_previous_frames(pins)
+    add_score_to_current_frame(pins)
+  end
+
+  def all_frames
+    @frames
+  end
+
+  def complete
+    frame_10 = @frames.filter { |frame| frame.round == 10 }
+    if frame_10 == []
+      false
+    elsif frame_10[0].complete == true && frame_10[0].bonuses.zero?
+      true
+    else
+      false
+    end
+  end
+
+  private
+
+  def add_bonus_to_previous_frames(pins)
+    @frames.each do |frame|
+      if frame.bonuses.positive? && frame.complete
+        frame.total_score += pins
+        frame.bonuses -= 1
+      end
+    end
+  end
+
+  def add_score_to_current_frame(pins)
+    current_frame = @frames.last
+    if current_frame.complete
+      new_frame = create_new_frame(current_frame, pins)
+      @frames << new_frame
+    else
+      current_frame.score << pins
+      current_frame.total_score += pins
+      set_frame_status(current_frame)
+      current_frame.complete = true
+    end
+  end
+
+  def create_new_frame(current_frame, pins)
+    new_frame = Frame.new
+    new_frame.round = current_frame.round + 1
+    new_frame.score = [pins]
+    new_frame.total_score = pins
+    new_frame.complete = false if pins != 10
+    set_frame_status(new_frame)
+
+    new_frame
+  end
+
+  def set_frame_status(frame)
+    return unless frame.total_score == 10
+
+    if frame.score[0] == 10
+      frame.status = 'strike'
+      frame.bonuses = 2
+    else
+      frame.status = 'spare'
+      frame.bonuses = 1
+    end
+  end
+end
diff --git a/lib/frame.rb b/lib/frame.rb
new file mode 100644
index 00000000..bc6ba15f
--- /dev/null
+++ b/lib/frame.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class Frame
+  attr_accessor :round, :score, :total_score, :status, :complete, :bonuses
+
+  def initialize
+    @complete = true
+    @round = 0
+    @score = 0
+    @total_score = 0
+    @bonuses = 0
+  end
+end
diff --git a/spec/app_spec.rb b/spec/app_spec.rb
new file mode 100644
index 00000000..c3eabc43
--- /dev/null
+++ b/spec/app_spec.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+require_relative '../app'
+require_relative '../lib/bowling_score_sheet'
+
+RSpec.describe BowlingApp do
+  it 'calculates the running score of a game with no strikes or spares' do
+    io = double :io
+    game = BowlingApp.new(io, BowlingScoreSheet.new)
+    game.roll('1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1')
+    expect(game.score).to eq 20
+
+    game = BowlingApp.new(io, BowlingScoreSheet.new)
+    game.roll('2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2')
+    expect(game.score).to eq 40
+
+    game = BowlingApp.new(io, BowlingScoreSheet.new)
+    game.roll('2,2,2,2,2,2,2,2,2,2')
+    game.roll('2,2,2,2,2,2,2,2,2,2')
+    expect(game.score).to eq 40
+  end
+
+  it 'calculates the running score of a game with one spare (not in final frame)' do
+    io = double :io
+    game = BowlingApp.new(io, BowlingScoreSheet.new)
+    game.roll('1,1,2,8,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1')
+    expect(game.score).to eq 29
+  end
+
+  it 'calculates the running score of a game with a mix of spares and stikes' do
+    io = double :io
+    BowlingScoreSheet.new
+
+    game = BowlingApp.new(io, BowlingScoreSheet.new)
+    game.roll('1,1,1,1,1,1,1,1,1,1,10,10,2,8,8,2,10,4,5')
+    expect(game.score).to eq 109
+  end
+end
diff --git a/spec/bowling_score_sheet_spec.rb b/spec/bowling_score_sheet_spec.rb
new file mode 100644
index 00000000..4bae18ac
--- /dev/null
+++ b/spec/bowling_score_sheet_spec.rb
@@ -0,0 +1,140 @@
+# frozen_string_literal: true
+
+require 'bowling_score_sheet'
+
+RSpec.describe BowlingScoreSheet do
+  it 'calculates the running score of a game with no strikes or spares' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+    20.times do
+      score_sheet.add_roll(1)
+    end
+
+    total_score = score_sheet.all_frames.sum(&:total_score)
+    expect(total_score).to eq 20
+  end
+
+  it 'calculates the running score of a game with a spare (not in final frame) and no strikes' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(8)
+
+    18.times do
+      score_sheet.add_roll(1)
+    end
+
+    total_score = score_sheet.all_frames.sum(&:total_score)
+    expect(total_score).to eq 29
+  end
+
+  it 'calculates the running score of a game with a strike (not in final frame) and no spares' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(3)
+    16.times do
+      score_sheet.add_roll(1)
+    end
+
+    total_score = score_sheet.all_frames.sum(&:total_score)
+    expect(total_score).to eq 36
+  end
+
+  it 'calculates the running score of a game with multiple strikes (not in final frame) and no spares' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(3)
+
+    14.times do
+      score_sheet.add_roll(1)
+    end
+
+    total_score = score_sheet.all_frames.sum(&:total_score)
+    expect(total_score).to eq 56
+  end
+
+  it 'calculates the running score of a game with multiple strikes and spares (not in final frame)' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(8)
+    score_sheet.add_roll(8)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(10)
+
+    10.times do
+      score_sheet.add_roll(1)
+    end
+
+    total_score = score_sheet.all_frames.sum(&:total_score)
+    expect(total_score).to eq 102
+  end
+
+  it 'calculates the running score of a game with a strike in final frame' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    18.times do
+      score_sheet.add_roll(1)
+    end
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(3)
+
+    total_score = score_sheet.all_frames.sum do |frame|
+      frame.round <= 10 ? frame.total_score : 0
+    end
+    expect(total_score).to eq 33
+  end
+
+  it 'calculates the running score of a game with a spare in final frame' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    19.times do
+      score_sheet.add_roll(1)
+    end
+    score_sheet.add_roll(9)
+    score_sheet.add_roll(2)
+
+    total_score = score_sheet.all_frames.sum do |frame|
+      frame.round <= 10 ? frame.total_score : 0
+    end
+    expect(total_score).to eq 30
+  end
+
+  it 'calculates the running score of a game with a mix of spares and stikes' do
+    double :io
+    score_sheet = BowlingScoreSheet.new
+
+    10.times do
+      score_sheet.add_roll(1)
+    end
+
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(8)
+    score_sheet.add_roll(8)
+    score_sheet.add_roll(2)
+    score_sheet.add_roll(10)
+    score_sheet.add_roll(4)
+    score_sheet.add_roll(5)
+
+    total_score = score_sheet.all_frames.sum do |frame|
+      frame.round <= 10 ? frame.total_score : 0
+    end
+    expect(total_score).to eq 109
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 00000000..4f8c8d91
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,98 @@
+# frozen_string_literal: true
+
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+  # The settings below are suggested to provide a good initial experience
+  # with RSpec, but feel free to customize to your heart's content.
+  #   # This allows you to limit a spec run to individual examples or groups
+  #   # you care about by tagging them with `:focus` metadata. When nothing
+  #   # is tagged with `:focus`, all examples get run. RSpec also provides
+  #   # aliases for `it`, `describe`, and `context` that include `:focus`
+  #   # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  #   config.filter_run_when_matching :focus
+  #
+  #   # Allows RSpec to persist some state between runs in order to support
+  #   # the `--only-failures` and `--next-failure` CLI options. We recommend
+  #   # you configure your source control system to ignore this file.
+  #   config.example_status_persistence_file_path = "spec/examples.txt"
+  #
+  #   # Limits the available syntax to the non-monkey patched syntax that is
+  #   # recommended. For more details, see:
+  #   # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
+  #   config.disable_monkey_patching!
+  #
+  #   # This setting enables warnings. It's recommended, but in some cases may
+  #   # be too noisy due to issues in dependencies.
+  #   config.warnings = true
+  #
+  #   # Many RSpec users commonly either run the entire suite or an individual
+  #   # file, and it's useful to allow more verbose output when running an
+  #   # individual spec file.
+  #   if config.files_to_run.one?
+  #     # Use the documentation formatter for detailed output,
+  #     # unless a formatter has already been configured
+  #     # (e.g. via a command-line flag).
+  #     config.default_formatter = "doc"
+  #   end
+  #
+  #   # Print the 10 slowest examples and example groups at the
+  #   # end of the spec run, to help surface which specs are running
+  #   # particularly slow.
+  #   config.profile_examples = 10
+  #
+  #   # Run specs in random order to surface order dependencies. If you find an
+  #   # order dependency and want to debug it, you can fix the order by providing
+  #   # the seed, which is printed after each run.
+  #   #     --seed 1234
+  #   config.order = :random
+  #
+  #   # Seed global randomization in this process using the `--seed` CLI option.
+  #   # Setting this allows you to use `--seed` to deterministically reproduce
+  #   # test failures related to randomization by passing the same `--seed` value
+  #   # as the one that triggered the failure.
+  #   Kernel.srand config.seed
+end