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Through a host of
publishing, lifestyle and entertainment platforms, HPG is able to
surround fans worldwide with consumer products that expand Hasbro's
core brands, such as G.

With a choice of six
chessboard sets, there are three ways to experience Chessmaster Challenge:

-- Learn -- If you're new to chess, Chessmaster Challenge is your teacher
and mentor, with more than 25 step-by-step audio tutorials to learn at
your own pace.

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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. (C)
2005 Hasbro. "PlayFirst is doing what it does best
-- delivering accessible entertainment experiences to a broad audience.

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"'YAHTZEE DELUXE' is our newest wireless rendition of a classic
hit," said Mitch Lasky, Chairman and CEO of JAMDAT Mobile Inc."

About PlayFirst, Inc. Available on more
than 250 sites and in 10 countries worldwide, PlayFirst games can be found
through channel partners such as Big Fish Games, MSN Games, Oberon, RealArcade ,
Shockwave.

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jamdat. Readers are
cautioned not to place undue reliance on forward-looking statements ,
which speak only as of the date they are made.com and Trygames.com.

NOTE: Chessmaster , Ubisoft, Ubi.

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com

About The Hasbro Properties Group

The Hasbro Properties Group (HPG) , the intellectual property
development arm of Hasbro, Inc. In Ranked Play, play against
top-ranked players and dominate your opponent as you move up the
rankings. It is the fastest growing company in the
videogame industry and has grown considerably through its strong and
diversified line up of products and partnerships.

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Business Editors/Entertainment Editors/Telecommunications Writers

LOS ANGELES----Global wireless
entertainment publisher JAMDAT Mobile Inc. 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 .com, as well as on its own site at PlayFirst.com. To learn more, please visit: http://www.

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(Photo: http://www.com.

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S. One hour of full-version gameplay is available for free at
http://www.newscom .

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(NASDAQ:JMDT) and
interactive games publisher Atari Interactive, Inc.jamdat.
YAHTZEE is a trademark of Hasbro and is used with permission.com, and the Ubisoft logo are trademarks
of Ubisoft Entertainment in the U.

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All rights reserved.com/cgi-bin/prnh/20050301/SFTU077 )
"We are thrilled to partner with Ubisoft to extend the reach of the
world's best-selling chess game," said John Welch, president and chief
executive officer, PlayFirst.
-- Play -- After mastering your skills, challenge a computer opponent to a
tournament-style game of chess in two modes of play.
PlayFirst , Inc. It is
committed to delivering high-quality, cutting-edge videogame titles to
consumers.

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(NASDAQ:JMDT) is a global publisher of
wireless entertainment applications, including games, ring tones,
images and other content.
Yahtzee Deluxe game programming code (C) 2005 Atari Interactive ,
Inc.ubisoftgroup.

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Please refer to JAMDAT's
reports and filings with the Securities and Exchange Commission for a
further discussion of these risks and uncertainties.95."
Chessmaster Challenge appeals to chess novices and masters alike, with
step-by-step tutorials for those playing chess for the first time, as well as
challenging tournament-style matches for chess experts. Ubisoft generated revenue of 508 million euros for the 2003-2004
fiscal year, an increase of 22. To learn more, please visit http://www.

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(NASDAQ:ATAR)
announced today the launch of "YAHTZEE DELUXE," a mobile version of
the classic board game that will be available through multiple
wireless carriers in the U. The first title to launch under an
extended licensing agreement between the two companies, "YAHTZEE
DELUXE " is the most complete YAHTZEE experience that can be played
anytime, anywhere, all on a mobile phone .com

About JAMDAT Mobile

JAMDAT Mobile Inc.

"By partnering with PlayFirst, we 're able to take chess to a more
mainstream audience," said Brenda Panagrossi, director of e-Commerce , Ubisoft.
"This downloadable version of our best-selling Chessmaster brand is great for
beginners and takes the intimidation factor out of chess.S.

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For more information,
please visit www., (NYSE:HAS ), translates one of the
industry's richest portfolios of brands into a world of fun and
excitement for children and adults globally. Factors that could cause JAMDAT's actual
results to differ materially from these forward-looking statements
include 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.

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"
"We're pleased to be working with JAMDAT to bring 'YAHTZEE
DELUXE,' one of several popular Hasbro games, to mobile users
everywhere," said Wim Stocks, Executive Vice President of Sales and
Marketing for Atari, Inc. "By offering these games on wireless
platforms and devices, we're introducing these great mass market game
brands to an entirely new audience, to be played and experienced in
wholly new ways.

(C)2005 JAMDAT Mobile Inc. publishes popular games targeted at the mass market
through all online consumer platforms.5% over the previous fiscal year at constant
exchange rates.

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"YAHTZEE DELUXE" features authentic YAHTZEE gameplay as players
roll dice to score points with both large and small straights, shoot
for four of a kind, or the ultimate -- a Yahtzee! The game allows
players to choose the strength of their computer opponent and pick
from three different game types: classic , rainbow and duplicate.
-- Fun -- In the mood for a quick brain-teasing puzzle? Fun Mode offers
eight types of chess challenges that help you master strategies like
finding Forks , Checks, Checkmates and Pinned pieces. PLAYFIRST and the
PLAYFIRST LOGO are trademarks of PlayFirst , Inc.

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All other trademarks are the property of their respective owners. Designed for chess players
of all levels, Chessmaster Challenge can be a teacher, mentor or the ultimate
opponent. As Internet penetration has grown to 90
million users in the U. and/or other countries.

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Simplified one-button controls allow gamers to select dice and scoring
categories easily. JOE, TRANSFORMERS, MY LITTLE PONY, MONOPOLY
and CANDY LAND, beyond the toy and game aisle, creating rich lifestyle
experiences .com and an unlimited version of the game can be downloaded for
$19.S.

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"The
game, which is the first product release under our recently extended
licensing agreement with Atari, enhances our wide slate of titles
designed to reach the growing market of casual mobile gamers. For specific information , JAMDAT's Game Finder is available
at www.I. With
Chessmaster Challenge, we're able to demystify the game of chess for those who
have not played before and make it enjoyable to chess players of all levels.
PlayFirst was founded in 2004 by veterans of Internet portals, traditional
games publishers and technology firms and received venture funding from
Mayfield and Trinity Ventures.

This category is for sites about board games which tell about the history of the game, give instructions on strategy , or are helpful to kids or teens wanting to learn about the game in some other way.

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JAMDAT's application portfolio is based on
original and licensed intellectual properties and includes JAMDAT
Bowling , Lemonade Tycoon(TM), Downtown Texas Hold 'Em, Bejeweled, The
Lord of the Rings(R), Tony Hawk's(R ) Underground and Scrabble(R).Downloadable Version of the World's Most Popular Game Allows Chess Novices and
Enthusiasts to Learn, Improve and Master Their Chess Game

SAN FRANCISCO , Have you ever wanted to discover
your inner chess genius? PlayFirst, the leading full-service publisher of
popular online games, and Ubisoft, one of the world's leading videogame
companies, today announced the launch of Chessmaster(R) Challenge, a
downloadable PC game based on the award-winning Chessmaster (R) series, which
has sold more than five million copies worldwide. In Training Mode,
request hints and learn moves with the help of a virtual chess coach,
helping you improve your game as you play. Ubisoft has offices in 21
countries and sales in more than 50 countries around the globe .

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Safe Harbor Statement -- JAMDAT Mobile Inc. Learn all the basics plus strategies used by chess
masters around the world. alone, including 30 million broadband customers, the
Internet has become a viable distribution outlet for games.playfirst.

About Ubisoft
Ubisoft is a leading producer, publisher and distributor of interactive
entertainment products worldwide .

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JAMDAT, JAMDAT Mobile and the bubbles
logo are trademarks of JAMDAT Mobile Inc.

PlayFirst and Ubisoft Partner to Bring Chess to the Mainstream With the Launch of Chessmaster(R) Challenge

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"
Game availability depends on individual phone model and wireless
carrier.
JAMDAT distributes its applications through wireless carriers,
including Boost Mobile, Cingular Wireless, 02 (UK), Nextel, NTT
DoCoMo, Orange , Sprint, Telefonica Moviles, T-Mobile, Verizon
Wireless, Virgin Mobile, Vivo and Vodafone. All Rights Reserved.playfirst.

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JAMDAT Mobile and Atari Launch ``YAHTZEE DELUXE'' for Wireless

Licensed by the Hasbro Properties
Group.