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A player may declare one of his/her monster zones to be affected by "Ground Collapse."
When resolving the effect of "Cyber Jar" or "Morphing Jar #2", if you pick up more monsters than you can Special Summon, due to "Ground Collapse", the monsters you cannot Special Summon are destroyed. If a "Sangan" or "Witch of the Black Forest" is destroyed this way, its effect does not activate.
If "Imperial Order" is active and negates the effect of "Ground Collapse," the monster zones affected by "Ground Collapse" may have monsters on them. If "Imperial Order" is later negated or leaves the field, monsters in the affected zones will remain unaffected. However, if those monsters leave the field, new monsters may not be placed on the affected zones as long as "Ground Collapse" is active.
While the effect of "Ground Collapse" is negated, monsters can be Summoned or Set into the selected Monster Card Zones. When "Ground Collapse" becomes active again, the selected Monster Card Zones cannot be used, but any monster in the selected Monster Card Zones remains there.
You cannot select a Monster Card Zone that is already selected by another "Ground Collapse".
If your opponent takes control of your monster with "Brain Control" and then activates "Ground Collapse", if there are no open Monster Card Zones for the monster to return to in the End Phase, it is destroyed.