JAMDAT Mobile Launches Tetris in South America; Tetris Now Available For First Time Ever to Wireless Customers Throughout Brazil

Global wireless entertainment publisher JAMDAT Mobile
Inc. (NASDAQ: JMDT) announced today the launch of Tetris(R) in Brazil,
marking the first time that the wireless version of the international
hit is available in South America. JAMDAT's version of the classic
puzzle game is available today on VIVO, the largest wireless carrier
in South America.
   One of the most widely played interactive games of all time,
Tetris is a simple, highly addictive puzzle game. Players attempt to
manipulate block-like pieces called "Tetriminos" as they drop into a
well. As the Tetriminos fall, players attempt to neatly arrange them
into a horizontal row. When the row is complete, it is removed from
the well, and the player's score increases.
   "Tetris has international appeal, and we are excited to bring it
to wireless users in South America for the first time," said Mitch
Lasky, Chairman and CEO of JAMDAT Mobile Inc. "Our Brazilian launch is
a significant step in our continuing effort to bring Tetris and our
other world class content to wireless gamers throughout South America,
an increasingly important part of the global wireless market."

   About JAMDAT Mobile

   JAMDAT Mobile Inc. is a global publisher of wireless entertainment
applications, including games, ring tones, images and other content.
JAMDAT's application portfolio is based on original and licensed
intellectual properties and includes JAMDAT Bowling, Tetris(R),
Downtown Texas Hold 'Em, Lemonade Tycoon(R), Bejeweled, The Lord of
the Rings(R), Tony Hawk's(R) Underground and Scrabble(R). JAMDAT
distributes its applications through wireless carriers around the
world. For more information, please visit www.jamdat.com.

   Safe Harbor Statement -- JAMDAT Mobile Inc.

   This press release may include forward-looking statements within
the meaning of the Private Securities Litigation Reform Act of 1995,
including statements related to anticipated revenues, expenses,
earnings, operating cash flows, the outlook for JAMDAT's markets and
the demand for its products. Factors that could cause JAMDAT's actual
results to differ materially from these forward-looking statements
include its ability to integrate the acquisition of Blue Lava
Wireless, anticipated growth in the handset market, its ability to
effectively market and sell products in diverse market segments, its
reliance on a limited number of products and third-party vendors and
distributors, its ability to expand studio operations, increases in
fulfillment costs, disruptions to information technology systems,
unpredictable events and circumstances relating to international
suppliers, increased competition, government regulatory action and
general economic conditions. Please refer to JAMDAT's reports and
filings with the Securities and Exchange Commission for a further
discussion of these risks and uncertainties. Readers are cautioned not
to place undue reliance on forward-looking statements, which speak
only as of the date they are made. JAMDAT undertakes no obligation to
update publicly any forward-looking statements to reflect new
information, events or circumstances after the date they were made or
to reflect the occurrence of unanticipated events.

   (C)2005 JAMDAT Mobile Inc. JAMDAT, JAMDAT Mobile and the bubbles
logo are trademarks of JAMDAT Mobile Inc.