Next to the freezer in the basement there is a huge thing of lockers and that is the rat cave.
{When you go in the basement make a left}
HOPE THAT HELPED!
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On Sims 2 Ds The Rat Cave is in the Basement in the Large Blue and Grey Doors by the Freezer. The doors look like lockers (hidden) and will open automatically if you walk up to them.
. You have to buy Rat Cave . wear rat suit . find Jimmy and friends .sneak up behind him and while the light is flashing press it
You have to get the rat cave well that is what I think it is called then u go in it when it done being built find the case with it and put it on
you need to obtain the rat suit from the rat cave located behind the lockers in the hallway where the freezer is located...once you get the suit click on the rat face where your cell phone usually is...the question mark will tell you what each icon means. good luck!
your sims can't get married in the sims 2 Castaway for the DS.