so now that 100b is out it looks like kuraud has implemented the big cloning room event among other things.
you're given a 1/10 chance to be taken there after variable 58 [■ｹﾞｰﾑｸﾘｱ回数] is greater than 1, which goes up while watching the credits to kuraud's train ending (#4).
so after seeing that ending atleast once you can probably see the cloning room event
edit: just did it, works perfectly. :P