diff --git a/tetris/modes/big_a2.lua b/tetris/modes/big_a2.lua
index 15fa1da..6e9b4b3 100755
--- a/tetris/modes/big_a2.lua
+++ b/tetris/modes/big_a2.lua
@@ -124,6 +124,7 @@ function MarathonA2Game:onLineClear(cleared_row_count)
 		self.grid:clear()
 		self.roll_frames = -150
 	end
+	if self.level >= 900 then self.lock_drop = true end
 end
 
 function MarathonA2Game:updateScore(level, drop_bonus, cleared_lines)
diff --git a/tetris/modes/konoha.lua b/tetris/modes/konoha.lua
index 102306d..6ce6dbb 100755
--- a/tetris/modes/konoha.lua
+++ b/tetris/modes/konoha.lua
@@ -20,7 +20,8 @@ function KonohaGame:new()
 	self.last_bonus_display_time = 0
 	self.time_limit = 10800
 	self.big_mode = true
-	
+
+	self.lock_drop = true	
 	self.enable_hold = true
 	self.next_queue_length = 3
 end
diff --git a/tetris/modes/marathon_a2.lua b/tetris/modes/marathon_a2.lua
index 99e255e..c6231df 100644
--- a/tetris/modes/marathon_a2.lua
+++ b/tetris/modes/marathon_a2.lua
@@ -151,6 +151,7 @@ function MarathonA2Game:onLineClear(cleared_row_count)
 		if self:qualifiesForMRoll() then self.grade = 32 end
 		self.roll_frames = -150
 	end
+	if self.level >= 900 then self.lock_drop = true end
 end
 
 function MarathonA2Game:updateSectionTimes(old_level, new_level)
diff --git a/tetris/modes/tgmplus.lua b/tetris/modes/tgmplus.lua
index 58840e0..21dc9e4 100644
--- a/tetris/modes/tgmplus.lua
+++ b/tetris/modes/tgmplus.lua
@@ -126,6 +126,7 @@ end
 function TGMPlusGame:onLineClear(cleared_row_count)
 	self.level = math.min(self.level + cleared_row_count, 999)
 	if self.level == 999 and not self.clear then self.clear = true end
+	if self.level >= 900 then self.lock_drop = true end
 end
 
 function TGMPlusGame:advanceBottomRow()