diff --git a/main.lua b/main.lua
index f54b3c1..c48c24f 100644
--- a/main.lua
+++ b/main.lua
@@ -35,6 +35,8 @@ function love.load()
 end
 
 function initModules()
+	-- replays are not loaded here, but they are cleared
+	replays = {}
 	game_modes = {}
 	mode_list = love.filesystem.getDirectoryItems("tetris/modes")
 	for i=1,#mode_list do
diff --git a/scene.lua b/scene.lua
index aaa81b8..cc5a2f6 100644
--- a/scene.lua
+++ b/scene.lua
@@ -10,7 +10,9 @@ function Scene:onInputRelease() end
 
 ExitScene = require "scene.exit"
 GameScene = require "scene.game"
+ReplayScene = require "scene.replay"
 ModeSelectScene = require "scene.mode_select"
+ReplaySelectScene = require "scene.replay_select"
 KeyConfigScene = require "scene.key_config"
 StickConfigScene = require "scene.stick_config"
 InputConfigScene = require "scene.input_config"
diff --git a/scene/replay.lua b/scene/replay.lua
new file mode 100644
index 0000000..7c875d3
--- /dev/null
+++ b/scene/replay.lua
@@ -0,0 +1,71 @@
+local Sequence = require 'tetris.randomizers.fixed_sequence'
+
+local ReplayScene = Scene:extend()
+
+ReplayScene.title = "Replay"
+
+function ReplayScene:new(replay, game_mode, ruleset, inputs)
+	self.secret_inputs = inputs
+	self.game = game_mode(self.secret_inputs)
+	self.ruleset = ruleset(self.game)
+	-- Replace piece randomizer with replay piece sequence
+	local randomizer = Sequence(table.keys(ruleset.colourscheme))
+	randomizer.sequence = replay["pieces"]
+	self.game:initializeReplay(self.ruleset, randomizer)
+	self.inputs = {
+		left=false,
+		right=false,
+		up=false,
+		down=false,
+		rotate_left=false,
+		rotate_left2=false,
+		rotate_right=false,
+		rotate_right2=false,
+		rotate_180=false,
+		hold=false,
+	}
+	self.paused = false
+	self.replay = replay
+	self.replay_index = 1
+	DiscordRPC:update({
+		details = self.game.rpc_details,
+		state = self.game.name,
+		largeImageKey = "ingame-"..self.game:getBackground().."00"
+	})
+end
+
+function ReplayScene:update()
+	if love.window.hasFocus() and not self.paused then
+		self.inputs = self.replay["inputs"][self.replay_index]["inputs"]
+		self.replay["inputs"][self.replay_index]["frames"] = self.replay["inputs"][self.replay_index]["frames"] - 1
+		if self.replay["inputs"][self.replay_index]["frames"] == 0 and self.replay_index < table.getn(self.replay["inputs"]) then
+			self.replay_index = self.replay_index + 1
+		end
+		local input_copy = {}
+		for input, value in pairs(self.inputs) do
+			input_copy[input] = value
+		end
+		self.game:update(input_copy, self.ruleset)
+		self.game.grid:update()
+		DiscordRPC:update({
+			largeImageKey = "ingame-"..self.game:getBackground().."00"
+		})
+	end
+end
+
+function ReplayScene:render()
+	self.game:draw(self.paused)
+end
+
+function ReplayScene:onInputPress(e)
+	if (e.input == "menu_back") then
+		self.game:onExit()
+		scene = ReplaySelectScene()
+	elseif e.input == "pause" and not (self.game.game_over or self.game.completed) then
+		self.paused = not self.paused
+		if self.paused then pauseBGM()
+		else resumeBGM() end
+	end
+end
+
+return ReplayScene
diff --git a/scene/replay_select.lua b/scene/replay_select.lua
new file mode 100644
index 0000000..c52d96c
--- /dev/null
+++ b/scene/replay_select.lua
@@ -0,0 +1,235 @@
+local ReplaySelectScene = Scene:extend()
+
+ReplaySelectScene.title = "Replays"
+
+local binser = require 'libs.binser'
+
+current_replay = 1
+
+function ReplaySelectScene:new()
+	-- reload custom modules
+	initModules()
+	-- load replays
+	replays = {}
+	replay_file_list = love.filesystem.getDirectoryItems("replays")
+	for i=1,#replay_file_list do
+		local data = love.filesystem.read("replays/"..replay_file_list[i])
+		local new_replay = binser.deserialize(data)[1]
+		-- Insert, sorting by date played, newest first
+		local start_index, mid_index, end_index = 1, 1, i
+		if i ~= 1 then
+			while start_index <= end_index do
+				mid_index = math.floor((start_index + end_index) / 2)
+				if os.difftime(replays[mid_index]["timestamp"], new_replay["timestamp"]) <= 0 then
+					-- search first half
+					end_index = mid_index - 1
+				else
+					-- search second half
+					start_index = mid_index + 1
+				end
+			end
+		end
+		table.insert(replays, mid_index, new_replay)
+	end
+	self.display_error = false
+	if table.getn(replays) == 0 then
+		self.display_warning = true
+		current_replay = 1
+	else
+		self.display_warning = false
+		if current_replay > table.getn(replays) then
+			current_replay = 1
+		end
+	end
+
+	self.menu_state = {
+		replay = current_replay,
+	}
+	self.secret_inputs = {}
+	self.das = 0
+	DiscordRPC:update({
+		details = "In menus",
+		state = "Choosing a replay",
+		largeImageKey = "ingame-000"
+	})
+end
+
+function ReplaySelectScene:update()
+	switchBGM(nil) -- experimental
+
+	if self.das_up or self.das_down or self.das_left or self.das_right then
+		self.das = self.das + 1
+	else
+		self.das = 0
+	end
+
+	if self.das >= 15 then
+		local change = 0
+		if self.das_up then
+			change = -1
+		elseif self.das_down then
+			change = 1
+		elseif self.das_left then
+			change = -9
+		elseif self.das_right then
+			change = 9
+		end
+		self:changeOption(change)
+		self.das = self.das - 4
+	end
+
+	DiscordRPC:update({
+		details = "In menus",
+		state = "Choosing a replay",
+		largeImageKey = "ingame-000"
+	})
+end
+
+function ReplaySelectScene:render()
+	love.graphics.draw(
+		backgrounds[0],
+		0, 0, 0,
+		0.5, 0.5
+	)
+
+	-- Same graphic as mode select
+	love.graphics.draw(misc_graphics["select_mode"], 20, 40)
+
+	if self.display_warning then
+		love.graphics.setFont(font_3x5_3)
+		love.graphics.printf(
+			"You have no replays.",
+			80, 200, 480, "center"
+		)
+		love.graphics.setFont(font_3x5_2)
+		love.graphics.printf(
+			"Come back to this menu after playing some games. " ..
+			"Press any button to return to the main menu.",
+			80, 250, 480, "center"
+		)
+		return
+	elseif self.display_error then
+		love.graphics.setFont(font_3x5_3)
+		love.graphics.printf(
+			"You are missing this mode or ruleset.",
+			80, 200, 480, "center"
+		)
+		love.graphics.setFont(font_3x5_2)
+		love.graphics.printf(
+			"Come back after getting the proper mode or ruleset. " ..
+			"Press any button to return to the main menu.",
+			80, 250, 480, "center"
+		)
+		return
+	end
+
+	love.graphics.setColor(1, 1, 1, 0.5)
+	love.graphics.rectangle("fill", 3, 258, 634, 22)
+
+	love.graphics.setFont(font_3x5_2)
+	for idx, replay in ipairs(replays) do
+		if(idx >= self.menu_state.replay-9 and idx <= self.menu_state.replay+9) then
+			local display_string = os.date("%c", replay["timestamp"]).."  "..replay["mode"].."  "..replay["ruleset"]
+			if replay["level"] ~= nil then
+				display_string = display_string.."  Level: "..replay["level"]
+			end
+			if replay["timer"] ~= nil then
+				display_string = display_string.."  Time: "..formatTime(replay["timer"])
+			end
+			love.graphics.printf(display_string, 6, (260 - 20*(self.menu_state.replay)) + 20 * idx, 640, "left")
+		end
+	end
+end
+
+function ReplaySelectScene:onInputPress(e)
+	if (self.display_warning or self.display_error) and e.input then
+		scene = TitleScene()
+	elseif e.type == "wheel" then
+		if e.x % 2 == 1 then
+			self:switchSelect()
+		end
+		if e.y ~= 0 then
+			self:changeOption(-e.y)
+		end
+	elseif e.input == "menu_decide" or e.scancode == "return" then
+		current_replay = self.menu_state.replay
+		-- Same as mode decide
+		playSE("mode_decide")
+		-- Get game mode and ruleset
+		local mode
+		local rules
+		for key, value in pairs(game_modes) do
+			if value.name == replays[self.menu_state.replay]["mode"] then
+				mode = value
+				break
+			end
+		end
+		for key, value in pairs(rulesets) do
+			if value.name == replays[self.menu_state.replay]["ruleset"] then
+				rules = value
+				break
+			end
+		end
+		if mode == nil or rules == nil then
+			self.display_error = true
+			return
+		end
+		-- TODO compare replay versions to current versions for Cambridge, ruleset, and mode
+		scene = ReplayScene(
+			replays[self.menu_state.replay],
+			mode,
+			rules,
+			self.secret_inputs
+		)
+	elseif e.input == "up" or e.scancode == "up" then
+		self:changeOption(-1)
+		self.das_up = true
+		self.das_down = nil
+		self.das_left = nil
+		self.das_right = nil
+	elseif e.input == "down" or e.scancode == "down" then
+		self:changeOption(1)
+		self.das_down = true
+		self.das_up = nil
+		self.das_left = nil
+		self.das_right = nil
+	elseif e.input == "left" or e.scancode == "left" then
+		self:changeOption(-9)
+		self.das_left = true
+		self.das_right = nil
+		self.das_up = nil
+		self.das_down = nil
+	elseif e.input == "right" or e.scancode == "right" then
+		self:changeOption(9)
+		self.das_right = true
+		self.das_left = nil
+		self.das_up = nil
+		self.das_down = nil
+	elseif e.input == "menu_back" or e.scancode == "delete" or e.scancode == "backspace" then
+		scene = TitleScene()
+	elseif e.input then
+		self.secret_inputs[e.input] = true
+	end
+end
+
+function ReplaySelectScene:onInputRelease(e)
+	if e.input == "up" or e.scancode == "up" then
+		self.das_up = nil
+	elseif e.input == "down" or e.scancode == "down" then
+		self.das_down = nil
+	elseif e.input == "right" or e.scancode == "right" then
+		self.das_right = nil
+	elseif e.input == "left" or e.scancode == "left" then
+		self.das_left = nil
+	elseif e.input then
+		self.secret_inputs[e.input] = false
+	end
+end
+
+function ReplaySelectScene:changeOption(rel)
+	local len = table.getn(replays)
+	self.menu_state.replay = Mod1(self.menu_state.replay + rel, len)
+	playSE("cursor")
+end
+
+return ReplaySelectScene
diff --git a/scene/title.lua b/scene/title.lua
index 05df3bb..6f111dc 100644
--- a/scene/title.lua
+++ b/scene/title.lua
@@ -5,6 +5,7 @@ TitleScene.restart_message = false
 
 local main_menu_screens = {
 	ModeSelectScene,
+	ReplaySelectScene,
 	SettingsScene,
 	CreditsScene,
 	ExitScene,
diff --git a/tetris/modes/gamemode.lua b/tetris/modes/gamemode.lua
index abbee8e..15b1da5 100644
--- a/tetris/modes/gamemode.lua
+++ b/tetris/modes/gamemode.lua
@@ -7,6 +7,7 @@ local playedGoSE = false
 local Grid = require 'tetris.components.grid'
 local Randomizer = require 'tetris.randomizers.randomizer'
 local BagRandomizer = require 'tetris.randomizers.bag'
+local binser = require 'libs.binser'
 
 local GameMode = Object:extend()
 
@@ -72,6 +73,9 @@ function GameMode:new(secret_inputs)
 	self.section_start_time = 0
 	self.section_times = { [0] = 0 }
 	self.secondary_section_times = { [0] = 0 }
+	self.replay_inputs = {}
+	self.replay_pieces = ""
+	self.save_replay = true
 end
 
 function GameMode:getARR() return 1 end
@@ -86,6 +90,7 @@ function GameMode:getGravity() return 1/64 end
 
 function GameMode:getNextPiece(ruleset)
 	local shape = self.used_randomizer:nextPiece()
+	self.replay_pieces = self.replay_pieces..shape
 	return {
 		skin = self:getSkin(),
 		shape = shape,
@@ -110,7 +115,18 @@ function GameMode:initialize(ruleset)
 	for i = 1, math.max(self.next_queue_length, 1) do
 		table.insert(self.next_queue, self:getNextPiece(ruleset))
 	end
-	self.lock_on_soft_drop = ({ruleset.softdrop_lock, self.instant_soft_drop, false, true })[config.gamesettings.manlock]
+	self.lock_on_soft_drop = ({ruleset.softdrop_lock, self.instant_soft_drop, false, true})[config.gamesettings.manlock]
+	self.lock_on_hard_drop = ({ruleset.harddrop_lock, self.instant_hard_drop, true,  false})[config.gamesettings.manlock]
+end
+
+function GameMode:initializeReplay(ruleset, randomizer)
+	self.used_randomizer = randomizer
+	self.save_replay = false
+	self.ruleset = ruleset
+	for i = 1, math.max(self.next_queue_length, 1) do
+		table.insert(self.next_queue, self:getNextPiece(ruleset))
+	end
+	self.lock_on_soft_drop = ({ruleset.softdrop_lock, self.instant_soft_drop, false, true})[config.gamesettings.manlock]
 	self.lock_on_hard_drop = ({ruleset.harddrop_lock, self.instant_hard_drop, true,  false})[config.gamesettings.manlock]
 end
 
@@ -129,6 +145,25 @@ function GameMode:update(inputs, ruleset)
 		end
 	end
 
+	-- check if inputs have changed since last frame
+	if self.prev_inputs["left"] ~= inputs["left"] or self.prev_inputs["right"] ~= inputs["right"]
+	   or self.prev_inputs["down"] ~= inputs["down"] or self.prev_inputs["up"] ~= inputs["up"]
+	   or self.prev_inputs["rotate_left"] ~= inputs["rotate_left"] or self.prev_inputs["rotate_right"] ~= inputs["rotate_right"]
+	   or self.prev_inputs["hold"] ~= inputs["hold"] or self.prev_inputs["rotate_180"] ~= inputs["rotate_180"]
+	   or self.prev_inputs["rotate_left2"] ~= inputs["rotate_left2"] or self.prev_inputs["rotate_right2"] ~= inputs["rotate_right2"] then
+		-- insert new inputs into replay inputs table
+		local new_inputs = {}
+		new_inputs["inputs"] = {}
+		new_inputs["frames"] = 1
+		for key, value in pairs(inputs) do
+			new_inputs["inputs"][key] = value
+		end
+		self.replay_inputs[#self.replay_inputs + 1] = new_inputs
+	else
+		-- add 1 to input frame counter
+		self.replay_inputs[#self.replay_inputs]["frames"] = self.replay_inputs[#self.replay_inputs]["frames"] + 1
+	end
+
 	-- advance one frame
 	if self:advanceOneFrame(inputs, ruleset) == false then return end
 
@@ -336,7 +371,41 @@ function GameMode:onGameOver()
 	switchBGM(nil)
 	local alpha = 0
 	local animation_length = 120
-	if self.game_over_frames < animation_length then
+	if self.game_over_frames == 1 then
+		alpha = 1
+		if self.save_replay then
+			-- Save replay.
+			local replay = {}
+			replay["inputs"] = self.replay_inputs
+			replay["pieces"] = self.replay_pieces
+			replay["mode"] = self.name
+			replay["ruleset"] = self.ruleset.name
+			replay["timer"] = self.frames
+			replay["score"] = self.score
+			replay["level"] = self.level
+			replay["lines"] = self.lines
+			replay["gamesettings"] = config.gamesettings
+			replay["timestamp"] = os.time()
+			if love.filesystem.getInfo("replays") == nil then
+				love.filesystem.createDirectory("replays")
+			end
+			local replay_files = love.filesystem.getDirectoryItems("replays")
+			-- Select replay filename that doesn't collide with an existing one
+			local replay_number = 0
+			local collision = true
+			while collision do
+				collision = false
+				replay_number = replay_number + 1
+				for key, file in pairs(replay_files) do
+					if file == replay_number..".rply" then
+						collision = true
+						break
+					end
+				end
+			end
+			love.filesystem.write("replays/"..replay_number..".rply", binser.serialize(replay))
+		end
+	elseif self.game_over_frames < animation_length then
 		-- Show field for a bit, then fade out.
 		alpha = math.pow(2048, self.game_over_frames/animation_length - 1)
 	elseif self.game_over_frames < 2 * animation_length then