diff --git a/tetris/modes/marathon_c88.lua b/tetris/modes/marathon_c88.lua
index 20e3e81..81cf50d 100644
--- a/tetris/modes/marathon_c88.lua
+++ b/tetris/modes/marathon_c88.lua
@@ -11,7 +11,7 @@ MarathonC88Game.name = "Marathon C88"
 MarathonC88Game.hash = "MarathonC88"
 MarathonC88Game.tagline = "An old Japanese game! Can you hit the max score?"
 
-function MarathonC88Game:new()
+function MarathonC88Game:new(secret_inputs)
 	self.super:new()
 
 	self.level_timer = 0
@@ -19,6 +19,16 @@ function MarathonC88Game:new()
 	self.tetrises = 0
 	self.line_clears = 0
 	
+	if secret_inputs.rotate_left and secret_inputs.rotate_right then
+		self.gravity_multiplier = 4
+	elseif secret_inputs.rotate_left then
+		self.gravity_multiplier = 2
+	elseif secret_inputs.rotate_right then
+		self.gravity_multiplier = 3
+	else
+		self.gravity_multiplier = 1
+	end
+	
 	self.randomizer = SegaRandomizer()
 
 	self.lock_drop = false
@@ -52,20 +62,24 @@ function MarathonC88Game:getLineClearDelay() return 42 end
 function MarathonC88Game:getLockDelay() return 30 end
 
 function MarathonC88Game:getGravity()
-	    if self.level == 0  then return 1/30
-	elseif self.level == 1  then return 1/15
-	elseif self.level == 2  then return 1/12
-	elseif self.level == 3  then return 1/10
-	elseif self.level == 4  then return 1/8
-	elseif self.level == 5  then return 1/6
-	elseif self.level == 6  then return 1/4
-	elseif self.level == 7  then return 1/2
-	elseif self.level <= 9  then return 1
-	elseif self.level == 10 then return 1/8
-	elseif self.level == 11 then return 1/6
-	elseif self.level == 12 then return 1/4
-	elseif self.level == 13 then return 1/2
-	else return 1 end
+	local gravity
+
+	    if self.level == 0  then gravity = 1/30
+	elseif self.level == 1  then gravity = 1/15
+	elseif self.level == 2  then gravity = 1/12
+	elseif self.level == 3  then gravity = 1/10
+	elseif self.level == 4  then gravity = 1/8
+	elseif self.level == 5  then gravity = 1/6
+	elseif self.level == 6  then gravity = 1/4
+	elseif self.level == 7  then gravity = 1/2
+	elseif self.level <= 9  then gravity = 1
+	elseif self.level == 10 then gravity = 1/8
+	elseif self.level == 11 then gravity = 1/6
+	elseif self.level == 12 then gravity = 1/4
+	elseif self.level == 13 then gravity = 1/2
+	else gravity = 1 end
+	
+	return gravity * self.gravity_multiplier
 end
 
 function MarathonC88Game:getLevelTimerLimit()
@@ -129,6 +143,12 @@ function MarathonC88Game:drawScoringInfo()
 	love.graphics.printf("SCORE", 240, 120, 40, "left")
 	love.graphics.printf("LINES", 240, 200, 40, "left")
 	love.graphics.printf("LEVEL", 240, 280, 40, "left")
+	if self.gravity_multiplier ~= 1 then
+		love.graphics.printf(
+			self.gravity_multiplier .. "x GRAVITY ACTIVE!",
+			240, 350, 150, "left"
+		)
+	end
 
 	love.graphics.setFont(font_3x5_3)
 	if self.score >= 999999 then love.graphics.setColor(1, 1, 0, 1) end
diff --git a/tetris/modes/marathon_c89.lua b/tetris/modes/marathon_c89.lua
index d9bfab9..03bf4e6 100644
--- a/tetris/modes/marathon_c89.lua
+++ b/tetris/modes/marathon_c89.lua
@@ -19,6 +19,7 @@ function MarathonC89Game:new()
 
 	self.ready_frames = 1
 	self.waiting_frames = 96
+	self.in_menu = true
 
 	self.start_level = 18
 	self.level = self.start_level
@@ -126,8 +127,19 @@ function MarathonC89Game:getGravity()
 	else return gravity_table[self.level] end
 end
 
-function MarathonC89Game:advanceOneFrame()
-	if self.waiting_frames > 0 then
+function MarathonC89Game:advanceOneFrame(inputs, ruleset)
+	if self.in_menu then
+		if not self.prev_inputs["right"] and inputs["right"] then
+			self.start_level = math.min(29, self.start_level + 1)
+		elseif not self.prev_inputs["left"] and inputs["left"] then
+			self.start_level = math.max(0, self.start_level - 1)
+		elseif inputs["hold"] then
+			self.in_menu = false
+		end
+		self.level = self.start_level
+		self.prev_inputs = copy(inputs)
+		return false
+	elseif self.waiting_frames > 0 then
 		self.waiting_frames = self.waiting_frames - 1
 	else
 		self.frames = self.frames + 1
@@ -195,9 +207,28 @@ function MarathonC89Game:drawScoringInfo()
 	love.graphics.printf(formatTime(self.frames), 64, 420, 160, "center")
 end
 
+function MarathonC89Game:drawCustom()
+	love.graphics.setColor(1, 1, 1, 1)
+	
+	if self.in_menu then
+		love.graphics.setFont(font_3x5_3)
+		love.graphics.printf("CHOOSE A LEVEL", 64, 120, 160, "center")
+
+		love.graphics.setFont(font_3x5_4)
+		love.graphics.printf(
+			(self.start_level == 0 and "-- " or "<- ") ..
+			(self.start_level <= 9 and 0 .. self.start_level or self.start_level) ..
+			(self.start_level == 29 and " --" or " ->"),
+			64, 200, 160, "center"
+		)
+
+		love.graphics.setFont(font_3x5_2)
+		love.graphics.printf("Press hold to start", 64, 260, 160, "center")
+	end
+end
 
 function MarathonC89Game:getBackground()
-	return math.min(self.level, 19)
+	return self.level % 20
 end
 
 function MarathonC89Game:getHighscoreData()