diff --git a/tetris/modes/credits_a3.lua b/tetris/modes/credits_a3.lua
index 104a011..32b2ca2 100644
--- a/tetris/modes/credits_a3.lua
+++ b/tetris/modes/credits_a3.lua
@@ -22,6 +22,7 @@ function CreditsA3Game:new()
 	self.lock_hard_drop = true
 	self.enable_hold = true
 	self.next_queue_length = 3
+	self.randomizer = History6RollsRandomizer()
 end
 
 function CreditsA3Game:getARE()
diff --git a/tetris/modes/marathon_c99.lua b/tetris/modes/marathon_c99.lua
index 88ff10a..9a4eea2 100644
--- a/tetris/modes/marathon_c99.lua
+++ b/tetris/modes/marathon_c99.lua
@@ -51,6 +51,7 @@ function MarathonC99Game:new()
     self.super:new()
     self.grid = Grid(10, 22)
 
+    self.randomizer = SegaRandomizer()
     self.additive_gravity = false
     self.roll_frames = 0
     self.lines_to_next_level = lines_to_next_level[self.level]
diff --git a/tetris/modes/survival_gte.lua b/tetris/modes/survival_gte.lua
index c54ff93..d834c77 100644
--- a/tetris/modes/survival_gte.lua
+++ b/tetris/modes/survival_gte.lua
@@ -16,6 +16,7 @@ function SurvivalGTEGame:new()
 	self.instant_soft_drop = false
 	self.enable_hold = true
     self.next_queue_length = 4
+    self.randomizer = Bag7Randomizer()
 end
 
 function SurvivalGTEGame:getARE() return 6 end