diff --git a/A b/A
new file mode 100755
index 0000000..1044606
--- /dev/null
+++ b/A
@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+# -*- coding: utf-8 -*-
+
+stand()
+saikoro=rand(100)+1
+if saikoro==1
+puts"1critical!"
+
+elsif saikoro>=5
+puts"critical!"
+
+elsif saikoro==100
+puts"100fumble!"
+
+elaif saikoro<=96
+puts"fumble!"
+printf("%d\n",saikoro)
+
diff --git a/bakudann.rb b/bakudann.rb
new file mode 100644
index 0000000..e512187
--- /dev/null
+++ b/bakudann.rb
@@ -0,0 +1,32 @@
+#!/usr/bin/env ruby
+#-*-coding: utf-8 -*-
+print"爆弾を発見した!\n"
+print"どのワイヤを切る?\n"
+puts"1:青"
+puts"2:赤"
+puts"3:黄色"
+puts"4:緑"
+waiya=rand(3)+1
+start=Time.now
+while true
+  sentaku=gets.chomp.to_i
+  if sentaku>=1&&sentaku<=4
+    break
+  else
+  print"そのワイヤはないよ!\n"
+  redo
+  end
+end
+stop=Time.now
+time=stop-start
+if time>15
+  print"ボカーーン!!\n"
+  print"あなたは死んでしまった!\n"
+else
+  if sentaku==waiya
+    print"あなたは爆弾を解除した!\n"
+  elsif sentaku>=1&&sentaku<=4
+    print"ボカーーン!!\n"
+    print"あなたは死んでしまった!\n"
+ end
+end
diff --git a/def.rb b/def.rb
new file mode 100644
index 0000000..84bd62d
--- /dev/null
+++ b/def.rb
@@ -0,0 +1,69 @@
+#!/uar/bin/env ruby
+# -*- coding: utf-8 -*-
+
+def kakunin(x)
+  printf("%s数を入力してね!\n",x)
+  kazu = gets.to_i
+end
+def kakezan(x,y)
+  x*y
+end
+
+def warizan(x,y)
+  x/y
+end
+
+def tasizan(x,y)
+  x+y
+end
+
+def hikizan(x,y)
+  x-y
+end
+
+def comment
+  puts"もう一度入力してね"
+end
+
+while true
+  
+  print"かけ算、割り算、足し算、引き算のうちどれかを選んでね!\n"
+  puts"1.かけ算"
+  puts"2.割り算"
+  puts"3.足し算"
+  puts"4.引き算"
+  puts"5.終わる"
+
+  go=gets.to_i
+  
+  if go==1
+    x = kakunin("かけられる")
+    y = kakunin("かける")
+    printf("答えは%dだよ!\n",kakezan(x,y))
+    redo
+
+  elsif go==2
+    x = kakunin("割られる")
+    y = kakunin("割る")
+    printf("答えは%dだよ!\n",warizan(x,y))
+    redo
+    
+  elsif go==3
+    x = kakunin("足される")
+    y = kakunin("足す")
+    printf("答えは%dだよ!\n",tasizan(x,y))
+    redo
+
+  elsif go==4
+    x = kakunin("引かれる")
+    y = kakunin("引く")
+    printf("答えは%dだよ!\n",hikizan(x,y))
+    redo
+    
+  elsif go==5
+    break
+
+  else
+    comment
+  end
+end
diff --git a/keisan.rb b/keisan.rb
new file mode 100644
index 0000000..78ab650
--- /dev/null
+++ b/keisan.rb
@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+# -*- coding: utf-8 -*-
+
+def keisan(x)
+  a = x*2
+  b = 1
+  c = a + b
+end
+
+puts "数値を入れてください。計算した結果を表示します。"
+y = gets.to_i
+printf("%d\n",keisan(y))
diff --git a/koyakusu.rb b/koyakusu.rb
new file mode 100644
index 0000000..eed570e
--- /dev/null
+++ b/koyakusu.rb
@@ -0,0 +1,47 @@
+#!/usr/bin/env ruby
+#-*- coding:utf-8 -*-
+
+i = 1
+a = 1
+yakusu1=[]
+yakusu2=[]
+koyakusu = []
+
+puts"最大公約数を出します"
+puts"1つ目の数字を入力してください"
+suzi1 = gets.to_i
+puts"2つ目の数字を入力してください"
+suzi2 = gets.to_i
+
+while i <= suzi1
+  x = suzi1 % i
+  if x == 0
+    yakusu1<< i
+  end
+  i +=1
+end
+
+while a <= suzi2
+  y = suzi2 % a
+  if y == 0
+    yakusu2 << a
+  end
+  a +=1
+end
+
+i = 0
+
+while i != yakusu1.length
+  yakusu2.each do |n|
+    if yakusu1[i] == n
+      koyakusu << n
+    end
+  end
+  i +=1
+end
+
+if koyakusu.reverse[0] != nil
+  printf("%dと%dの最大公約数は%dです\n",suzi1,suzi2,koyakusu.reverse[0])
+else
+  printf("%dと%dに公約数はありません\n",suzi1,suzi2)
+end