emergency rescue needed

I had/have a test DB where a number of files got corrupted. I just HAVE be able to open this DB.
I am willing to sacrafice the data in the corrupted files. What are the steps to do so?
It is something along the lines of STARTUP NOMOUNT ALTER TABLESPACE ???? OFFLINE;
DROP TABLESPACE ?????;
STARTUP MOUNT;
ALTER DATABASE OPEN; I've just looked in Metalink & did not find where this procedure is documented.

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