Exhibit 99.1

FOR IMMEDIATE RELEASE

                                       Contacts:

                                       Kristin Mulvihill-Southey
                                       Vice President, Investor Relations
                                       (310) 255-2635
                                       Ksouthey@activision.com

                                       Maryanne Lataif
                                       Vice President, Corporate Communications
                                       (310) 255-2704
                                       Mlataif@activision.com


                              ACTIVISION ANNOUNCES
                           FOUR-FOR-THREE STOCK SPLIT

Santa  Monica,  CA -  September  28,  2005 -  Activision,  Inc.  (NASDAQ:  ATVI)
announced  today that its Board of  Directors  approved a  four-for-three  stock
split of its outstanding  shares of common stock to be effected in the form of a
33-1/3% common stock dividend.

The stock dividend is payable October 24, 2005, to stockholders of record at the
close of business on October 10, 2005.  Stockholders will receive one additional
share of common stock for every three shares held on the record date. In lieu of
issuing any fractional  shares in connection with the split,  stockholders  will
receive a cash payment  based on the average of the high and low sales prices of
the common stock on the record date, as adjusted for the split.  Activision will
have  approximately  273,000,000  shares of common stock  outstanding  after the
split.

"We are thrilled that  Activision's  record growth and investors'  confidence in
our future have made this possible," stated Robert A. Kotick, Chairman and Chief
Executive  Officer of  Activision.  "The stock split was  motivated  by a strong
desire on our part to obtain a broader range of investors and improve the market
liquidity  in our stock and by our  confidence  that the value of our stock will
continue to increase over time."

Headquartered  in  Santa  Monica,  California,  Activision,  Inc.  is a  leading
worldwide developer,  publisher and distributor of interactive entertainment and
leisure  products.  Founded  in 1979,  Activision  posted net  revenues  of $1.4
billion for the fiscal year ended March 31, 2005.

Activision maintains operations in the U.S., Canada, the United Kingdom, France,
Germany, Italy, Japan, Australia,  Scandinavia,  Spain and the Netherlands. More
information  about  Activision  and its products  can be found on the  company's
World Wide Web site, which is located at www.activision.com.

The  statements  made in this press  release that are not  historical  facts are
"forward-looking  statements".  These  forward-looking  statements  are based on
current   expectations   and   assumptions   that  are   subject  to  risks  and
uncertainties.  The Company cautions readers of this press release that a number
of important  factors could cause  Activision's  actual future results to differ
materially from those  expressed in any such  forward-looking  statements.  Such
factors include,  without limitation,  product delays,  retail acceptance of our
products,  industry  competition,  rapid  changes  in  technology  and  industry
standards,  protection of proprietary rights,  maintenance of relationships with
key personnel,  vendors and third-party  developers,  international economic and
political   conditions,   integration  of  recently  acquired  subsidiaries  and
identification  of suitable future  acquisition  opportunities.  These important
factors and other factors that potentially could affect the Company's  financial
results  are  described  in  our  filings  with  the   Securities  and  Exchange
Commission,  including the Company's  most recent Annual report on Form 10-K and
Quarterly  Report on Form 10-Q.  Readers of this press  release are  referred to
such filings.  The Company may change its intention,  belief or expectation,  at
any time and  without  notice,  based upon any changes in such  factors,  in the
Company's  assumptions  or  otherwise.  The Company  undertakes no obligation to
release  publicly any  revisions to any  forward-looking  statements  to reflect
events or  circumstances  after the date hereof or to reflect the  occurrence of
unanticipated events.

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