diff --git a/02.calendar/calendar.rb b/02.calendar/calendar.rb
new file mode 100644
index 0000000000..d7cdcc7be6
--- /dev/null
+++ b/02.calendar/calendar.rb
@@ -0,0 +1,46 @@
+require 'date'
+require 'optparse'
+
+# コマンドラインでparseする
+options = {}
+OptionParser.new do |opts|
+  opts.banner = "Usage: ruby calendar.rb [options]"
+
+  opts.on("-m", "--month MONTH", Integer, "Specify the month (1-12)") do |month|
+    options[:month] = month
+  end
+
+  opts.on("-y", "--year YEAR", Integer, "Specify the year") do |year|
+    options[:year] = year
+  end
+end.parse!
+
+# 今の日付を取る
+current_date = Date.today
+year = options[:year] || current_date.year
+month = options[:month] || current_date.month
+
+# date enumeratorを作る
+date_range = Date.new(year, month, 1)..Date.new(year, month, -1)
+dates_enum = date_range.to_enum
+
+# カレンダーを表示する
+puts "\n#{Date::MONTHNAMES[month]} #{year}".center(20)
+puts "日 月 火 水 木 金 土"
+
+# 最初の日に計算する
+initial_offset = dates_enum.peek.wday
+
+# 見やすいのため
+print "   " * initial_offset
+
+# １ヶ月分表示する
+dates_enum.each do |date|
+  print date.day.to_s.rjust(2) + " "
+
+  # 土曜日になったら新しいラインを作る
+  puts if date.saturday?
+end
+
+puts "\n"
+
diff --git a/03.bowling/bowling.rb b/03.bowling/bowling.rb
new file mode 100644
index 0000000000..b1b3215d15
--- /dev/null
+++ b/03.bowling/bowling.rb
@@ -0,0 +1,52 @@
+require 'rubocop'
+require 'debug'
+
+score = ARGV[0]
+scores = score.split(',')
+shots = []
+
+scores.each do |s|
+  if s == 'X'
+    shots << 10
+    shots << 0
+  else
+    shots << s.to_i
+  end
+end
+
+frames = []
+shots.each_slice(2) do |s|
+  frames << s
+end
+p frames
+point = 0
+
+frames.each_with_index do |frame, index|
+    # binding.break
+  if index >=9
+    point += frame.sum
+#   elsif frame_index == 11
+
+  else
+    if frame[0] == 10
+        if frames[index + 1][0] == 10
+            if frames[index + 2][0] == 10
+                point += 30
+            else
+                point += 20 + frames[index + 2][0]
+            end
+
+        else
+            point += 10 + frames[index + 1].sum
+        end
+
+      
+    elsif frame.sum == 10
+      point += 10 + frames[index + 1][0]
+    else
+      point += frame.sum
+    end
+  end
+end
+
+puts point