JAMDAT Mobile to Provide Prizes for MONOPOLY(TM) Best Chance Game 2.0 at McDonald's(TM)

FOR IMMEDIATE RELEASE

LOS ANGELES, CA - (October 28, 2004) - Global wireless entertainment publisher JAMDAT Mobile Inc., announced today it is providing game prizes for MONOPOLY Best Chance Game 2.0, now available at participating McDonald's restaurants through November 8 or while supplies last. JAMDAT is providing the following wireless and PC games as prizes:

• "JAMDAT Bowling" (wireless)

• "JAMDAT SPORTS Golf 2004" (wireless)

• "JAMDAT Solitaire" (wireless)

• "Lemonade Tycoon" (PC)

• "The Emperor's Mahjong" (PC)

MONOPOLY Best Chance Game 2.0 offers consumers the familiar McDonald's promotional game, plus a new online version (www.playatmcd.com) where consumers have a chance to win electronic and downloadable prizes - including JAMDAT wireless and PC games.

"We are pleased to be working with McDonald's to provide prizes for MONOPOLY Best Chance Game 2.0, McDonald's most popular promotional game," said Mitch Lasky, Chairman and CEO of JAMDAT Mobile Inc. "Consumers who win will be able to download and enjoy JAMDAT wireless or PC games including 'JAMDAT Bowling' and 'Lemonade Tycoon.'"

The availability of JAMDAT wireless games will depend on a consumer's wireless carrier and phone model.

About JAMDAT Mobile

JAMDAT Mobile Inc. (NASDAQ: JMDT) 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," "Lemonade Tycoon^TM," "Bejeweled," "The Lord of the Rings^TM," "Tony Hawk's^TM Underground" and "Scrabble^TM." JAMDAT distributes its applications through wireless carriers, including AT&T Wireless, China Mobile, Cingular, 02 (UK), Nextel, NTT DoCoMo, Orange, Sprint, Telefonica Moviles, T-Mobile, Verizon Wireless, Vivo and Vodafone. For additional information, please visit www.jamdat.com.

Safe Harbor Statement - JAMDAT Mobile Inc.

This press release includes forward-looking statements, 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 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 our reports and filings with the Securities and Exchange Commission, including our S-1 IPO filing, for a further discussion of these risks and uncertainties. We also caution you not to place undue reliance on forward-looking statements, which speak only as of the date they are made. We undertake 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.

About McDonald's

McDonald's is the leading global foodservice retailer with more than 30,000 restaurants serving nearly 47 million people in more than 120 countries each day. Approximately 80 percent of McDonald's restaurants worldwide are owned and operated by independent, local businessmen and women. For nutritional information, please visit www.mcdonalds.com.

(C) 2004 JAMDAT Mobile Inc. JAMDAT, JAMDAT Mobile and the bubbles logo are trademarks of JAMDAT Mobile Inc.

MONOPOLY: ^®, ^TM & (C) 2004 Hasbro

(C) 2004 McDonald's Corporation

MEDIA CONTACT:

for JAMDAT Mobile, Inc.

Dena Cook

310.566.2283

dena.cook@zenogroup.com