diff --git a/tetris/modes/interval_training.lua b/tetris/modes/interval_training.lua
index 740bb7e..786a8da 100644
--- a/tetris/modes/interval_training.lua
+++ b/tetris/modes/interval_training.lua
@@ -15,8 +15,8 @@ IntervalTrainingGame.tagline = "Can you clear the time hurdles when the game goe
 
 
 function IntervalTrainingGame:new()
-	self.level = 0
 	IntervalTrainingGame.super:new()
+
 	self.roll_frames = 0
 	self.combo = 1
 	self.randomizer = History6RollsRandomizer()
@@ -29,12 +29,6 @@ function IntervalTrainingGame:new()
 	self.next_queue_length = 3
 end
 
-function IntervalTrainingGame:initialize(ruleset)
-	self.section_time_limit = 1800
-	if ruleset.world then self.section_time_limit = 37 * 60 end
-	self.super.initialize(self, ruleset)
-end
-
 function IntervalTrainingGame:getARE()
 	return 6
 end
@@ -63,7 +57,7 @@ function IntervalTrainingGame:getSection()
 	return math.floor(level / 100) + 1
 end
 
-function IntervalTrainingGame:advanceOneFrame()
+function IntervalTrainingGame:advanceOneFrame(inputs, ruleset)
 	if self.clear then
 		self.roll_frames = self.roll_frames + 1
 		if self.roll_frames > 2968 then
@@ -74,6 +68,8 @@ function IntervalTrainingGame:advanceOneFrame()
 		if self:getSectionTime() >= self.section_time_limit then
 			self.game_over = true
 		end
+	else
+		self.section_time_limit = ruleset.world and 37 * 60 or 1800
 	end
 	return true
 end
diff --git a/tetris/modes/joker.lua b/tetris/modes/joker.lua
index 99feee4..1ced15b 100644
--- a/tetris/modes/joker.lua
+++ b/tetris/modes/joker.lua
@@ -3,7 +3,7 @@ require 'funcs'
 local GameMode = require 'tetris.modes.gamemode'
 local Piece = require 'tetris.components.piece'
 
-local History6RollsRandomizer = require 'tetris.randomizers.history_6rolls'
+local DTETRandomizer = require 'tetris.randomizers.dtet'
 
 local JokerGame = GameMode:extend()
 
@@ -14,7 +14,7 @@ JokerGame.tagline = "One of the hardest modes! Can you retain your stock to leve
 function JokerGame:new()
 	self.super:new()
 
-	self.randomizer = History6RollsRandomizer()
+	self.randomizer = DTETRandomizer()
 	
 	self.level = 50
 	self.stock = 0
diff --git a/tetris/modes/marathon_c89.lua b/tetris/modes/marathon_c89.lua
index c3cfafd..d9bfab9 100644
--- a/tetris/modes/marathon_c89.lua
+++ b/tetris/modes/marathon_c89.lua
@@ -42,7 +42,7 @@ function MarathonC89Game:getDasLimit() return 16 end
 function MarathonC89Game:getARR() return 6 end
 
 function MarathonC89Game:getARE()
-	    if self.last_row > 22 then return 10
+		if self.last_row > 22 then return 10
 	elseif self.last_row > 18 then return 12
 	elseif self.last_row > 14 then return 14
 	elseif self.last_row > 10 then return 16
diff --git a/tetris/modes/marathon_gf.lua b/tetris/modes/marathon_gf.lua
new file mode 100644
index 0000000..941225d
--- /dev/null
+++ b/tetris/modes/marathon_gf.lua
@@ -0,0 +1,240 @@
+require 'funcs'
+
+local GameMode = require 'tetris.modes.gamemode'
+local Bag7Randomizer = require 'tetris.randomizers.bag7'
+
+local MarathonGFGame = GameMode:extend()
+
+MarathonGFGame.name = "Marathon GF"
+MarathonGFGame.hash = "MarathonGF"
+MarathonGFGame.tagline = "The old puzzle mode from Tetris Friends!"
+
+function MarathonGFGame:new()
+    self.super:new()
+
+    self.back_to_back = false
+    self.roll_limit = 10
+    self.roll_frames = 0
+    self.message = ""
+    self.message_timer = 0
+    self.randomizer = Bag7Randomizer()
+    self.combo = 0
+
+    self.lock_drop = true
+	self.lock_hard_drop = true
+	self.instant_hard_drop = true
+	self.instant_soft_drop = false
+	self.enable_hold = true
+    self.next_queue_length = 5
+end
+
+function MarathonGFGame:getARE() return 6 end
+function MarathonGFGame:getLineARE() return 6 end
+function MarathonGFGame:getLineClearDelay() return 24 end
+function MarathonGFGame:getDasLimit() return config.das end
+function MarathonGFGame:getARR() return config.arr end
+
+function MarathonGFGame:getGravity()
+    if self.lines < 180 then
+        return (0.8 - (math.floor(self.lines / 10) * 0.007)) ^ -math.floor(self.lines / 10) / 60
+    elseif self.lines < 200 then return 20
+    else return 1/4 end
+end
+
+function MarathonGFGame:getDropSpeed()
+    return self:getGravity() * 20
+end
+
+function MarathonGFGame:advanceOneFrame()
+	if self.clear then
+		self.roll_frames = self.roll_frames + 1
+        if self.roll_frames < 0 then return false
+        else self.frames = self.frames + 1 end
+        if self.roll_frames >= self.roll_limit + 10 then
+            self.roll_frames = 0
+            self.roll_limit = self.roll_limit + 5
+        end
+	elseif self.ready_frames == 0 then
+        self.frames = self.frames + 1
+    end
+    if self.drop_bonus > 0 then
+        self.score = self.score + self.drop_bonus
+        self.drop_bonus = 0
+    end
+	return true
+end
+
+function MarathonGFGame:onLineClear(cleared_row_count)
+	if not self.clear then
+		local new_lines = self.lines + cleared_row_count
+		self:updateSectionTimes(self.lines, new_lines)
+		self.lines = math.min(new_lines, 200)
+		if self.lines == 200 then
+			self.clear = true
+			self.roll_frames = -150
+		end
+	end
+end
+
+function MarathonGFGame:getSectionTime()
+	return self.frames - self.section_start_time
+end
+
+function MarathonGFGame:updateSectionTimes(old_lines, new_lines)
+	if math.floor(old_lines / 10) < math.floor(new_lines / 10) then
+		-- record new section
+		table.insert(self.section_times, self:getSectionTime())
+		self.section_start_time = self.frames
+	end
+end
+
+function MarathonGFGame:updateScore(level, drop_bonus, cleared_lines)
+    local normal_table = {[0] = 0, 1, 3, 5, 8}
+    local spin_score = 4 * (cleared_lines + 1)
+    local all_clear_table = {8, 12, 18, 20}
+
+    if self.grid:checkForBravo(cleared_lines) then
+        self.score = self.score + (
+            ((self.back_to_back and cleared_lines == 4)
+            and 32 or all_clear_table[cleared_lines]) *
+            100 * (math.floor(self.lines / 10) + 1)
+        )
+    end
+
+    if cleared_lines > 0 then
+        self.score = self.score + (
+            self.combo * 50 * (math.floor(self.lines / 10) + 1)
+        )
+    end
+
+    if self.piece.spin then
+        self.score = self.score + (
+            spin_score * 100 *
+            (math.floor(self.lines / 10) + 1) *
+            ((self.back_to_back and cleared_lines ~= 0) and 1.5 or 1)
+        )
+        if cleared_lines ~= 0 then
+            self.back_to_back = true
+            self.combo = self.combo + 1
+        else self.combo = 0 end
+    elseif cleared_lines > 0 then
+        self.score = self.score + (
+            normal_table[cleared_lines] * 100 *
+            (math.floor(self.lines / 10) + 1) *
+            ((self.back_to_back and cleared_lines == 4) and 1.5 or 1)
+        )
+        if cleared_lines == 4 then self.back_to_back = true
+        else self.back_to_back = false end
+        self.combo = self.combo + 1
+    else self.combo = 0 end
+end
+
+function MarathonGFGame:onAttemptPieceMove(piece)
+    if self.piece ~= nil then
+        if not piece:isMoveBlocked(self.grid, { x=-1, y=0 }) and
+           not piece:isMoveBlocked(self.grid, { x=1, y=0 }) then
+            piece.spin = false
+        end
+    end
+end
+
+function MarathonGFGame:onAttemptPieceRotate(piece)
+    if self.piece ~= nil and piece:isDropBlocked(self.grid) and
+       piece:isMoveBlocked(self.grid, { x=-1, y=0 }) and 
+       piece:isMoveBlocked(self.grid, { x=1, y=0 }) and
+       piece:isMoveBlocked(self.grid, { x=0, y=-1 }) then
+        piece.spin = true
+    end
+end
+
+function MarathonGFGame:onPieceLock(piece, cleared_row_count)
+    self.super:onPieceLock()
+    if self.grid:checkForBravo(cleared_row_count) then
+        self.message = "ALL CLEAR!"
+    elseif piece.spin then
+        self.message = (self.back_to_back and cleared_row_count ~= 0 and "B2B " or "") ..
+                       piece.shape .. "-SPIN " ..
+                       cleared_row_count .. "!"
+    elseif cleared_row_count == 4 then
+        self.message = (self.back_to_back and "B2B " or "") ..
+                       "QUADRA!"
+    elseif cleared_row_count ~= 0 and self.combo > 0 then
+        self.message = "COMBO " .. self.combo .. "!"
+    else
+        self.message = ""
+    end
+    self.message_timer = 60
+end
+
+MarathonGFGame.rollOpacityFunction = function(age)
+    return 0.5
+end
+
+MarathonGFGame.mRollOpacityFunction = function(age)
+    return 0
+end
+
+function MarathonGFGame:drawGrid(ruleset)
+    if not self.game_over then
+        if self.lines >= 200 and self.roll_frames >= self.roll_limit then
+            self.grid:drawInvisible(self.rollOpacityFunction)
+        elseif self.lines >= 200 then
+            self.grid:drawInvisible(self.mRollOpacityFunction)
+        else self.grid:draw() end
+    else self.grid:draw() end
+    self:drawGhostPiece(ruleset)
+end
+
+function MarathonGFGame:getHighscoreData()
+    return {
+        score = self.score,
+        frames = self.frames,
+    }
+end
+
+function MarathonGFGame:getBackground()
+    return math.min(19, math.floor(self.lines / 10))
+end
+
+function MarathonGFGame:drawScoringInfo()
+    love.graphics.setColor(1, 1, 1, 1)
+
+	love.graphics.setFont(font_3x5_2)
+	love.graphics.print(
+		self.das.direction .. " " ..
+		self.das.frames .. " " ..
+		strTrueValues(self.prev_inputs)
+	)
+    love.graphics.printf("NEXT", 64, 40, 40, "left")
+    love.graphics.printf("SCORE", 240, 180, 80, "left")
+	love.graphics.printf("LEVEL", 240, 250, 80, "left")
+	love.graphics.printf("LINES", 240, 320, 40, "left")
+
+	local current_section = math.floor(self.lines / 10) + 1
+    self:drawSectionTimesWithSplits(current_section)
+    
+    if self.message_timer > 0 then
+        love.graphics.printf(self.message, 64, 400, 160, "center")
+        self.message_timer = self.message_timer - 1
+    end
+
+    love.graphics.setFont(font_3x5_3)
+    love.graphics.printf(self.score, 240, 200, 120, "left")
+	love.graphics.printf(self.lines, 240, 340, 40, "right")
+	love.graphics.printf(self.clear and self.lines or self:getSectionEndLines(), 240, 370, 40, "right")
+
+	if not self.game_over and self.clear and self.roll_frames % 4 < 2 then
+		love.graphics.setColor(1, 1, 0.3, 1)
+	end
+    love.graphics.printf(math.floor(self.lines / 10) + 1, 240, 270, 160, "left")
+    love.graphics.setColor(1, 1, 1, 1)
+    
+    love.graphics.setFont(font_8x11)
+	love.graphics.printf(formatTime(self.frames), 64, 420, 160, "center")
+end
+
+function MarathonGFGame:getSectionEndLines()
+	return math.floor(self.lines / 10 + 1) * 10
+end
+
+return MarathonGFGame
\ No newline at end of file
diff --git a/tetris/modes/marathon_wcb.lua b/tetris/modes/marathon_wcb.lua
index 58b578e..535ef23 100644
--- a/tetris/modes/marathon_wcb.lua
+++ b/tetris/modes/marathon_wcb.lua
@@ -23,7 +23,7 @@ function MarathonWCBGame:new()
 	self.instant_hard_drop = true
 	self.instant_soft_drop = true
 	self.enable_hold = false
-	self.next_queue_length = 3
+	self.next_queue_length = 6
 
     self.piece_is_active = false
 end
diff --git a/tetris/modes/non.lua b/tetris/modes/non.lua
index ce1873a..4cb4e38 100644
--- a/tetris/modes/non.lua
+++ b/tetris/modes/non.lua
@@ -19,6 +19,8 @@ function NightOfNights:new()
 
     self.lock_drop = true
     self.lock_hard_drop = true
+    self.instant_soft_drop = false
+    self.instant_hard_drop = false
     self.enable_hold = true
     self.next_queue_length = 3
 end
@@ -26,7 +28,8 @@ end
 function NightOfNights:getARE() return 0 end
 function NightOfNights:getLineARE() return 0 end
 function NightOfNights:getLineClearDelay() return 0 end
-function NightOfNights:getDasLimit() return 6 end
+function NightOfNights:getDasLimit() return config.das end
+function NightOfNights:getARR() return config.arr end
 function NightOfNights:getGravity() return 20 end
 
 function NightOfNights:whilePieceActive()
diff --git a/tetris/modes/pro_tl.lua b/tetris/modes/pro_tl.lua
index 0988485..cf8afe1 100644
--- a/tetris/modes/pro_tl.lua
+++ b/tetris/modes/pro_tl.lua
@@ -13,11 +13,11 @@ function ProGame:new()
     self.super:new()
     self.next_queue_length = 6
 	self.randomizer = TetraRandomizer()
-	self.active_time = 0
 end
 
 function ProGame:initialize(ruleset)
 	self.super.initialize(self, ruleset)
+	ruleset.onPieceDrop = function() end
 	ruleset.onPieceMove = function() end
 	ruleset.onPieceRotate = function() end
 end
@@ -25,12 +25,13 @@ end
 function ProGame:getARE() return 6 end
 function ProGame:getLineARE() return 6 end
 function ProGame:getLineClearDelay() return 6 end
-function ProGame:getDasLimit() return 6 end
+function ProGame:getDasLimit() return config.das end
+function ProGame:getARR() return config.arr end
 function ProGame:getDropSpeed() return 20 end
 
 function ProGame:getGravity()
     if self.lines < 20 then return 1
-    elseif self.lines < 40 then return 3
+    elseif self.lines < 40 then return 2
     elseif self.lines < 60 then return 5
     else return 20 end
 end
@@ -69,14 +70,18 @@ function ProGame:advanceOneFrame(inputs, ruleset)
 end
 
 function ProGame:onPieceEnter()
-	self.active_time = 0
+	self.section_clear = false
+	self.piece.lowest_y = -math.huge
+end
+
+function ProGame:onHold()
+	self.piece.lowest_y = -math.huge
 end
 
 function ProGame:whilePieceActive()
-	if self.piece:isDropBlocked(self.grid) then
-		self.active_time = self.active_time + 1
-		self.piece.locked = self.active_time >= self:getLockDelay() * 4
-	end
+	self.piece.lock_delay = self.piece.lowest_y < self.piece.position.y
+							and 0 or self.piece.lock_delay
+	self.piece.lowest_y = math.max(self.piece.lowest_y, self.piece.position.y)
 end
 
 function ProGame:onLineClear(cleared_row_count)
diff --git a/tetris/modes/race_40.lua b/tetris/modes/race_40.lua
index 62039f8..b5431ea 100644
--- a/tetris/modes/race_40.lua
+++ b/tetris/modes/race_40.lua
@@ -36,9 +36,6 @@ function Race40Game:new()
 	self.instant_soft_drop = false
 	self.enable_hold = true
 	self.next_queue_length = 3
-	
-	self.irs = false
-	self.ihs = false
 end
 
 function Race40Game:getDropSpeed()
@@ -46,7 +43,7 @@ function Race40Game:getDropSpeed()
 end
 
 function Race40Game:getARR()
-	return 1
+	return config.arr
 end
 
 function Race40Game:getARE()
@@ -58,7 +55,7 @@ function Race40Game:getLineARE()
 end
 
 function Race40Game:getDasLimit()
-	return 8
+	return config.das
 end
 
 function Race40Game:getLineClearDelay()
@@ -86,6 +83,11 @@ function Race40Game:advanceOneFrame()
 	return true
 end
 
+function Race40Game:onPieceEnter()
+	self.irs = false
+	self.ihs = false
+end
+
 function Race40Game:onPieceLock()
 	self.super:onPieceLock()
 	self.pieces = self.pieces + 1
diff --git a/tetris/modes/speed.lua b/tetris/modes/speed.lua
index 73e1416..a9b070e 100644
--- a/tetris/modes/speed.lua
+++ b/tetris/modes/speed.lua
@@ -40,7 +40,8 @@ end
 function LudicrousSpeed:getARE() return 0 end
 function LudicrousSpeed:getLineARE() return 0 end
 function LudicrousSpeed:getLineClearDelay() return 0 end
-function LudicrousSpeed:getDasLimit() return 8 end
+function LudicrousSpeed:getDasLimit() return config.das end
+function LudicrousSpeed:getARR() return config.arr end
 function LudicrousSpeed:getDropSpeed() return 20 end
 
 local function mean(t)
diff --git a/tetris/randomizers/dtet.lua b/tetris/randomizers/dtet.lua
new file mode 100644
index 0000000..ccdcd78
--- /dev/null
+++ b/tetris/randomizers/dtet.lua
@@ -0,0 +1,66 @@
+local Randomizer = require 'tetris.randomizers.randomizer'
+
+local DTETRandomizer = Randomizer:extend()
+
+function DTETRandomizer:initialize()
+    -- keep a tally of how long each piece has been droughted
+    self.droughts = {
+        ["I"] = 0,
+        ["J"] = 0,
+        ["L"] = 0,
+        ["O"] = 0,
+        ["S"] = 0,
+        ["T"] = 0,
+        ["Z"] = 0
+    }
+end
+
+function DTETRandomizer:updateDroughts(piece)
+    -- update drought counters
+    for k, v in pairs(self.droughts) do
+        if k == piece then
+            self.droughts[k] = 0
+        else
+            self.droughts[k] = v + 1
+        end
+    end
+end
+
+function DTETRandomizer:generatePiece()
+    local droughts = {}
+    local weights = {}
+    local bag = {}
+    
+    -- copy drought table
+    for k, v in pairs(self.droughts) do
+        droughts[k] = v
+    end
+
+    -- assign weights to each piece
+    for i = 1, 7 do
+        local lowest_drought = math.huge
+        local lowest_drought_piece = ""
+        for k, v in pairs(droughts) do
+            if v ~= nil and v < lowest_drought then
+                lowest_drought = v
+                lowest_drought_piece = k
+            end
+        end
+        droughts[lowest_drought_piece] = nil
+        weights[lowest_drought_piece] = i - 1
+    end
+
+    -- insert pieces into 21-bag
+    for k, v in pairs(weights) do
+        for i = 1, v do
+            table.insert(bag, k)
+        end
+    end
+
+    -- pull piece from 21-bag and update drought counters
+    local generated = bag[math.random(#bag)]
+    self:updateDroughts(generated)
+    return generated
+end
+
+return DTETRandomizer
\ No newline at end of file
diff --git a/tetris/randomizers/history.lua b/tetris/randomizers/history.lua
new file mode 100644
index 0000000..cfa394a
--- /dev/null
+++ b/tetris/randomizers/history.lua
@@ -0,0 +1,38 @@
+local Randomizer = require 'tetris.randomizers.randomizer'
+
+local HistoryRandomizer = Randomizer:extend()
+
+function HistoryRandomizer:new(history_length, rolls, allowed_pieces)
+    self.history = {}
+    for i = 1, history_length do
+        table.insert(self.history, '')
+    end
+    self.rolls = rolls
+    self.allowed_pieces = allowed_pieces
+end
+
+function HistoryRandomizer:generatePiece()
+	for i = 1, self.rolls do
+		local x = math.random(table.getn(self.allowed_pieces))
+		if not inHistory(self.allowed_pieces[x], self.history) or i == self.rolls then
+			return self:updateHistory(self.allowed_pieces[x])
+		end
+	end
+end
+
+function HistoryRandomizer:updateHistory(shape)
+	table.remove(self.history, 1)
+	table.insert(self.history, shape)
+	return shape
+end
+
+function inHistory(piece, history)
+	for idx, entry in pairs(history) do
+		if entry == piece then
+			return true
+		end
+	end
+	return false
+end
+
+return HistoryRandomizer
\ No newline at end of file
diff --git a/tetris/rulesets/dtet.lua b/tetris/rulesets/dtet.lua
index c7bb811..b522100 100644
--- a/tetris/rulesets/dtet.lua
+++ b/tetris/rulesets/dtet.lua
@@ -109,4 +109,4 @@ end
 
 function DTET:getDefaultOrientation() return 3 end
 
-return DTET
+return DTET
\ No newline at end of file
diff --git a/tetris/rulesets/srs_x.lua b/tetris/rulesets/srs_x.lua
index 66b484b..27de630 100644
--- a/tetris/rulesets/srs_x.lua
+++ b/tetris/rulesets/srs_x.lua
@@ -23,6 +23,7 @@ function SRS:onPieceMove(piece, grid)
 	if piece:isDropBlocked(grid) then
 		piece.manipulations = piece.manipulations + 1
 		if piece.manipulations >= 24 then
+			piece:dropToBottom(grid)
 			piece.locked = true
 		end
 	end
@@ -33,6 +34,7 @@ function SRS:onPieceRotate(piece, grid)
 	if piece:isDropBlocked(grid) then
 		piece.rotations = piece.rotations + 1
 		if piece.rotations >= 12 then
+			piece:dropToBottom(grid)
 			piece.locked = true
 		end
 	end
diff --git a/tetris/rulesets/trans.lua b/tetris/rulesets/trans.lua
new file mode 100644
index 0000000..33e86e9
--- /dev/null
+++ b/tetris/rulesets/trans.lua
@@ -0,0 +1,48 @@
+local ARS = require 'tetris.rulesets.arika'
+local Trans = ARS:extend()
+
+Trans.name = "TransRS"
+Trans.hash = "TransRS"
+
+function Trans:attemptRotate(new_inputs, piece, grid, initial)
+	local rot_dir = 0
+	
+	if (new_inputs["rotate_left"] or new_inputs["rotate_left2"]) then
+		rot_dir = 3
+	elseif (new_inputs["rotate_right"] or new_inputs["rotate_right2"]) then
+		rot_dir = 1
+	elseif (new_inputs["rotate_180"]) then
+		rot_dir = 2
+	end
+
+	if rot_dir == 0 then return end
+    if config.gamesettings.world_reverse == 3 or (self.world and config.gamesettings.world_reverse == 2) then
+        rot_dir = 4 - rot_dir
+    end
+
+    local new_piece = piece:withRelativeRotation(rot_dir)
+    local pieces = {"I", "J", "L", "O", "S", "T", "Z"}
+    repeat
+        new_piece.shape = pieces[math.random(7)]
+    until piece.shape ~= new_piece.shape
+
+	if (grid:canPlacePiece(new_piece)) then
+		self:onPieceRotate(piece, grid)
+        piece:setRelativeRotation(rot_dir)
+        piece.shape = new_piece.shape
+	else
+		if not(initial and self.enable_IRS_wallkicks == false) then
+			if (grid:canPlacePiece(new_piece:withOffset({x=1, y=0}))) then
+                self:onPieceRotate(piece, grid)
+                piece:setRelativeRotation(rot_dir):setOffset({x=1, y=0})
+                piece.shape = new_piece.shape
+            elseif (grid:canPlacePiece(new_piece:withOffset({x=-1, y=0}))) then
+                self:onPieceRotate(piece, grid)
+                piece:setRelativeRotation(rot_dir):setOffset({x=-1, y=0})
+                piece.shape = new_piece.shape
+            end
+		end
+	end
+end
+
+return Trans
\ No newline at end of file