diff --git a/load/bgm.lua b/load/bgm.lua
index 21aa1d2..2eb03c6 100644
--- a/load/bgm.lua
+++ b/load/bgm.lua
@@ -9,31 +9,38 @@ local current_bgm = nil
 local bgm_locked = false
 
 function switchBGM(sound, subsound)
-	if bgm_locked then return end
 	if current_bgm ~= nil then
 		current_bgm:stop()
 	end
-	if subsound ~= nil then
-		current_bgm = bgm[sound][subsound]
-		resetBGMFadeout()
+	if bgm_locked or config.bgm_volume <= 0 then
+		current_bgm = nil
 	elseif sound ~= nil then
-		current_bgm = bgm[sound]
-		resetBGMFadeout()
+		if subsound ~= nil then
+			current_bgm = bgm[sound][subsound]
+		else
+			current_bgm = bgm[sound]
+		end
 	else
 		current_bgm = nil
 	end
+	if current_bgm ~= nil then
+		resetBGMFadeout()
+	end
 end
 
 function switchBGMLoop(sound, subsound)
-	if bgm_locked then return end
 	switchBGM(sound, subsound)
-	current_bgm:setLooping(true)
+	if current_bgm then current_bgm:setLooping(true) end
 end
 
 function lockBGM()
 	bgm_locked = true
 end
 
+function unlockBGM()
+	bgm_locked = false
+end
+
 local fading_bgm = false
 local fadeout_time = 0
 local total_fadeout_time = 0
@@ -53,7 +60,7 @@ function resetBGMFadeout(time)
 end
 
 function processBGMFadeout(dt)
-	if fading_bgm then
+	if current_bgm and fading_bgm then
 		fadeout_time = fadeout_time - dt
 		if fadeout_time < 0 then
 			fadeout_time = 0
diff --git a/load/sounds.lua b/load/sounds.lua
index 7e0b80b..0dfae21 100644
--- a/load/sounds.lua
+++ b/load/sounds.lua
@@ -27,33 +27,37 @@ sounds = {
 }
 
 function playSE(sound, subsound)
-	if subsound == nil then
-		sounds[sound]:setVolume(config.sfx_volume)
-		if sounds[sound]:isPlaying() then
-			sounds[sound]:stop()
+	if sound ~= nil then
+		if subsound ~= nil then
+			sounds[sound][subsound]:setVolume(config.sfx_volume)
+			if sounds[sound][subsound]:isPlaying() then
+				sounds[sound][subsound]:stop()
+			end
+			sounds[sound][subsound]:play()
+		else
+			sounds[sound]:setVolume(config.sfx_volume)
+			if sounds[sound]:isPlaying() then
+				sounds[sound]:stop()
+			end
+			sounds[sound]:play()
 		end
-		sounds[sound]:play()
-	else
-		sounds[sound][subsound]:setVolume(config.sfx_volume)
-		if sounds[sound][subsound]:isPlaying() then
-			sounds[sound][subsound]:stop()
-		end
-		sounds[sound][subsound]:play()
 	end
 end
 
 function playSEOnce(sound, subsound)
-	if subsound == nil then
-		sounds[sound]:setVolume(config.sfx_volume)
-		if sounds[sound]:isPlaying() then
-			return
+	if sound ~= nil then
+		if subsound ~= nil then
+			sounds[sound][subsound]:setVolume(config.sfx_volume)
+			if sounds[sound][subsound]:isPlaying() then
+				return
+			end
+			sounds[sound][subsound]:play()
+		else
+			sounds[sound]:setVolume(config.sfx_volume)
+			if sounds[sound]:isPlaying() then
+				return
+			end
+			sounds[sound]:play()
 		end
-		sounds[sound]:play()
-	else
-		sounds[sound][subsound]:setVolume(config.sfx_volume)
-		if sounds[sound][subsound]:isPlaying() then
-			return
-		end
-		sounds[sound][subsound]:play()
 	end
 end
\ No newline at end of file
diff --git a/scene/game.lua b/scene/game.lua
index babb6e5..d9dcf35 100644
--- a/scene/game.lua
+++ b/scene/game.lua
@@ -42,62 +42,17 @@ function GameScene:update()
 end
 
 function GameScene:render()
-	love.graphics.setColor(1, 1, 1, 1)
-	love.graphics.draw(
-		backgrounds[self.game:getBackground()],
-		0, 0, 0,
-		0.5, 0.5
-	)
-
-	-- game frame
-	if self.game.grid.width == 10 and self.game.grid.height == 24 then
-		love.graphics.draw(misc_graphics["frame"], 48, 64)
-	end
-	
-	love.graphics.setColor(0, 0, 0, 200)
-	love.graphics.rectangle(
-		"fill", 64, 80,
-		16 * self.game.grid.width, 16 * (self.game.grid.height - 4)
-	)
-	
-	if self.game.grid.width ~= 10 or self.game.grid.height ~= 24 then
-		love.graphics.setColor(174/255, 83/255, 76/255, 1)
-		love.graphics.setLineWidth(8)
-		love.graphics.line(
-			60,76,
-			68+16*self.game.grid.width,76,
-			68+16*self.game.grid.width,84+16*(self.game.grid.height-4),
-			60,84+16*(self.game.grid.height-4),
-			60,76
-		)
-		love.graphics.setColor(203/255, 137/255, 111/255, 1)
-		love.graphics.setLineWidth(4)
-		love.graphics.line(
-			60,76,
-			68+16*self.game.grid.width,76,
-			68+16*self.game.grid.width,84+16*(self.game.grid.height-4),
-			60,84+16*(self.game.grid.height-4),
-			60,76
-		)
-		love.graphics.setLineWidth(1)
-	end
-
+	self.game:drawBackground()
+	self.game:drawFrame()
 	self.game:drawGrid()
 	if self.game.lcd > 0 then self.game:drawLineClearAnimation() end
 	self.game:drawPiece()
 	self.game:drawNextQueue(self.ruleset)
 	self.game:drawScoringInfo()
-
-	-- ready/go graphics
-
-	if self.game.ready_frames <= 100 and self.game.ready_frames > 52 then
-		love.graphics.draw(misc_graphics["ready"], 144 - 50, 240 - 14)
-	elseif self.game.ready_frames <= 50 and self.game.ready_frames > 2 then
-		love.graphics.draw(misc_graphics["go"], 144 - 27, 240 - 14)
-	end
-
+	self.game:drawReadyGo()
 	self.game:drawCustom()
 
+	love.graphics.setColor(1, 1, 1, 1)
 	love.graphics.setFont(font_3x5_2)
 	if config.gamesettings.display_gamemode == 1 then
 		love.graphics.printf(self.game.name .. " - " .. self.ruleset.name, 0, 460, 640, "left")
diff --git a/tetris/components/piece.lua b/tetris/components/piece.lua
index d1d302a..cfde50e 100644
--- a/tetris/components/piece.lua
+++ b/tetris/components/piece.lua
@@ -118,6 +118,7 @@ function Piece:lockIfBottomed(grid)
 end
 
 function Piece:addGravity(gravity, grid, classic_lock)
+	gravity = gravity / (self.big and 2 or 1)
 	local new_gravity = self.gravity + gravity
 	if self:isDropBlocked(grid) then
 		if classic_lock then
diff --git a/tetris/modes/gamemode.lua b/tetris/modes/gamemode.lua
index dedc1dc..d7c98fd 100644
--- a/tetris/modes/gamemode.lua
+++ b/tetris/modes/gamemode.lua
@@ -325,11 +325,13 @@ function GameMode:onPieceEnter() end
 function GameMode:onHold() end
 
 function GameMode:onSoftDrop(dropped_row_count)
-	self.drop_bonus = self.drop_bonus + 1 * dropped_row_count
+	self.drop_bonus = self.drop_bonus + (
+		(self.piece.big and 2 or 1) * dropped_row_count
+	)
 end
 
 function GameMode:onHardDrop(dropped_row_count)
-	self.drop_bonus = self.drop_bonus + 2 * dropped_row_count
+	self:onSoftDrop(dropped_row_count * 2)
 end
 
 function GameMode:onGameOver()
@@ -838,6 +840,61 @@ function GameMode:drawSectionTimesWithSplits(current_section, section_limit)
 	end
 end
 
+function GameMode:drawBackground()
+	love.graphics.setColor(1, 1, 1, 1)
+	love.graphics.draw(
+		backgrounds[self:getBackground()],
+		0, 0, 0,
+		0.5, 0.5
+	)
+end
+
+function GameMode:drawFrame()
+	-- game frame
+	if self.grid.width == 10 and self.grid.height == 24 then
+		love.graphics.draw(misc_graphics["frame"], 48, 64)
+	end
+	
+	love.graphics.setColor(0, 0, 0, 200)
+	love.graphics.rectangle(
+		"fill", 64, 80,
+		16 * self.grid.width, 16 * (self.grid.height - 4)
+	)
+	
+	if self.grid.width ~= 10 or self.grid.height ~= 24 then
+		love.graphics.setColor(174/255, 83/255, 76/255, 1)
+		love.graphics.setLineWidth(8)
+		love.graphics.line(
+			60,76,
+			68+16*self.grid.width,76,
+			68+16*self.grid.width,84+16*(self.grid.height-4),
+			60,84+16*(self.grid.height-4),
+			60,76
+		)
+		love.graphics.setColor(203/255, 137/255, 111/255, 1)
+		love.graphics.setLineWidth(4)
+		love.graphics.line(
+			60,76,
+			68+16*self.grid.width,76,
+			68+16*self.grid.width,84+16*(self.grid.height-4),
+			60,84+16*(self.grid.height-4),
+			60,76
+		)
+		love.graphics.setLineWidth(1)
+	end
+end
+
+function GameMode:drawReadyGo()
+	-- ready/go graphics
+	love.graphics.setColor(1, 1, 1, 1)
+
+	if self.ready_frames <= 100 and self.ready_frames > 52 then
+		love.graphics.draw(misc_graphics["ready"], 144 - 50, 240 - 14)
+	elseif self.ready_frames <= 50 and self.ready_frames > 2 then
+		love.graphics.draw(misc_graphics["go"], 144 - 27, 240 - 14)
+	end
+end
+
 function GameMode:drawCustom() end
 
 return GameMode
diff --git a/tetris/rulesets/ruleset.lua b/tetris/rulesets/ruleset.lua
index abee732..623e537 100644
--- a/tetris/rulesets/ruleset.lua
+++ b/tetris/rulesets/ruleset.lua
@@ -161,11 +161,6 @@ function Ruleset:dropPiece(
 	inputs, piece, grid, gravity, drop_speed, drop_locked, hard_drop_locked,
 	hard_drop_enabled, additive_gravity, classic_lock
 )
-	if piece.big then
-		gravity = gravity / 2
-		drop_speed = drop_speed / 2
-	end
-
 	local y = piece.position.y
 	if inputs["down"] == true and drop_locked == false then
 		if additive_gravity then