What do you call the game mode/map where....

What do you call the game mode/map where you all start with a single mex but when you build it the surrounded squares become available to build on etc etc
haven't seen it played in ages

Crazyrush

Also there are some adaptive maps that have one or more "crazy" mexes on them, but lots of regular mexes too.

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There's a crazy rush mod as well

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