diff --git a/lib/bcdice/game_system.rb b/lib/bcdice/game_system.rb
index 0d6254bad..5dd78aac8 100644
--- a/lib/bcdice/game_system.rb
+++ b/lib/bcdice/game_system.rb
@@ -83,6 +83,7 @@
 require "bcdice/game_system/Fiasco_Korean"
 require "bcdice/game_system/FilledWith"
 require "bcdice/game_system/FullMetalPanic"
+require "bcdice/game_system/FullFace"
 require "bcdice/game_system/FutariSousa"
 require "bcdice/game_system/FutariSousa_Korean"
 require "bcdice/game_system/Garako"
diff --git a/lib/bcdice/game_system/FullFace.rb b/lib/bcdice/game_system/FullFace.rb
new file mode 100644
index 000000000..b416d66ad
--- /dev/null
+++ b/lib/bcdice/game_system/FullFace.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+module BCDice
+  module GameSystem
+    class FullFace < Base
+      # ゲームシステムの識別子
+      ID = 'FullFace'
+
+      # ゲームシステム名
+      NAME = 'フルフェイス'
+
+      # ゲームシステム名の読みがな
+      SORT_KEY = 'ふるふえいす'
+
+      # ダイスボットの使い方
+      HELP_MESSAGE = <<~INFO_MESSAGETEXT
+        ■判定　x+bFF<=t   x:ヒート(省略時は3) b:判定修正 t:能力値
+
+        例)FF<=2:   能力値2で判定し、その結果(成功数,1の目の数,バースト)を表示。
+           6FF<=3:  ヒート6,能力値3で戦闘判定し、その結果( 〃 )を表示。
+           8+2FF<=3:ヒート8,判定修正+2,能力値3で戦闘判定し、その結果( 〃 )を表示。
+      INFO_MESSAGETEXT
+
+      register_prefix('([+\d]+)*FF')
+
+      def eval_game_system_specific_command(command)
+        resolute_action(command)
+      end
+
+      private
+
+      # 技能判定
+      # @param [String] command
+      # @return [Result]
+      def resolute_action(command)
+        m = /^(\d*)([+\d]+)*FF<=(\d)$/.match(command)
+        return nil unless m
+
+        heat_level = m[1].to_i
+        heat_level = 3 if heat_level == 0
+        modify = Arithmetic.eval("0#{m[2]}", @round_type)
+        status_no = m[3].to_i
+
+        dice_array = []
+
+        dice = @randomizer.roll_barabara(heat_level, 6)
+        ones = dice.count(1)
+        sixs = dice.count(6)
+        success_num = dice.count { |val| val <= status_no }
+        dice_array.push(dice.join(","))
+
+        if modify > 0
+          dice = @randomizer.roll_barabara(modify, 6)
+          ones += dice.count(1)
+          success_num += dice.count { |val| val <= status_no }
+          dice_array.push(dice.join(","))
+        end
+        ones_total = ones
+
+        while ones > 0
+          dice = @randomizer.roll_barabara(ones, 6)
+          ones = dice.count(1)
+          ones_total += ones
+          success_num += dice.count { |val| val <= status_no }
+          dice_array.push(dice.join(","))
+        end
+
+        return Result.new.tap do |result|
+          if sixs >= 2
+            result.fumble = true
+            result.condition = false
+          else
+            result.condition = (success_num > 0)
+            result.critical = (ones_total > 0)
+          end
+          result_txt = []
+          result_txt.push("成功度(#{success_num})")
+          result_txt.push("1の目(#{ones_total})") if ones_total > 0
+          result_txt.push("バースト") if result.fumble?
+
+          sequence = [
+            "(#{heat_level}#{Format.modifier(modify)}FF<=#{status_no})",
+            dice_array.join('+').to_s,
+            result_txt.join(',').to_s,
+          ].compact
+
+          result.text = sequence.join(" ＞ ")
+        end
+      end
+    end
+  end
+end
diff --git a/test/data/FullFace.toml b/test/data/FullFace.toml
new file mode 100644
index 000000000..eb13dd610
--- /dev/null
+++ b/test/data/FullFace.toml
@@ -0,0 +1,113 @@
+[[ test ]]
+game_system = "FullFace"
+input = "8FF<=3 成功度"
+output = "(8FF<=3) ＞ 6,5,4,3,2,2,5,4 ＞ 成功度(3)"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "8FF<=3 成功度及び１の目"
+output = "(8FF<=3) ＞ 6,5,4,3,2,1,5,4+3 ＞ 成功度(4),1の目(1)"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "8FF<=3 成功度及び１の目及びバースト"
+output = "(8FF<=3) ＞ 6,5,4,3,2,1,6,5+4 ＞ 成功度(3),1の目(1),バースト"
+fumble = true
+failure = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "8FF<=3 成功度及び１の目及びバーストせず"
+output = "(8FF<=3) ＞ 6,5,4,3,2,1,5,4+6 ＞ 成功度(3),1の目(1)"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 6 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "8FF<=3 多重1の目"
+output = "(8FF<=3) ＞ 6,5,4,3,2,1,5,4+1+3 ＞ 成功度(5),1の目(2)"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 3 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "FF<=3 一般判定"
+output = "(3FF<=3) ＞ 6,5,4 ＞ 成功度(0)"
+failure = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "FullFace"
+input = "+2FF<=3 一般判定"
+output = "(3+2FF<=3) ＞ 6,5,4+3,2 ＞ 成功度(2)"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+]
+