| Fruit Machine |  Reel Good Time | 2004 | Global Games |
| Slot Machine | Reel Heroes | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Slot Machine | Reel Legends | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Slot Machine | Relic Hunter | 2004 | Konami Gaming, Inc. Las Vegas, NV, USA |
| PC/MS-Windows CD | Replay 4 | 2004 | Open Mind World Korea |
| Nokia N-Gage card | Requiem of Hell | 2004 | Nokia |
| Pachinko | Rerere ni Omakase | 2004 | Daiichi Denshi |
| Video Slot Machine | Resident | 2004 | Igrosoft |
| PC/MS-Windows CD | Return to Mysterious Island | 2004 | DreamCatcher Interactive |
| GCE Vectrex | Revector Hb | 2004 | Packrat Video Games, LLC |
| Colecovision cart. | Reversi & Diamond Dash Hb | 2004 | Amy Marie Bienvenu |
| Slot Machine | Rex | 2004 | Bally Wulff |
| Slot Machine | Rex Go 3 | 2004 | Bumwoo Co. Korea |
| Sony PlayStation CD | Rhythm Beat Model SLES-04146 | 2004 | Phoenix Games |
| Nintendo GameCube disc |  Ribbit King Model DOL-GKRE-USA | 2004 | Bandai America, Inc. 45557 |
| Nintendo GameCube disc | Ribbit King Model DOL-GKRP-EUR | 2004 | Bandai Co., Ltd. Japan |
| Slot Machine | Riches of India | 2004 | AGI Austrian Gaming Industries Novomatic Group |
| Slot Machine | Riches of the Amazon | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Nintendo DS cart. | Ridge Racer DS Model NTR-ARRE-USA | 2004 | NAMCO Hometek, Ltd. USA |
| Sony PSP UMD | Ridge Racers Model UCAS-40015 | 2004 | NAMCO, Ltd. Japan |
| Pinball | Ripley's Believe it or Not! | 2004 | Stern Pinball, Inc. Melrose Park, IL, USA |
| Medal video game | Rising Sun 2 | 2004 | Unknown Korea |
| Medal video game | Rising Sun 3 | 2004 | Unknown Korea |
| Slot Machine | Risk & Reward | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Nintendo GBA cart. | River City Ransom EX Model AGB-BDTE-USA | 2004 | Atlus USA, Inc. CA, USA |
| Nintendo GBA cart. | Riviera - Yakusoku no Chi Riviera Model AGB-BREJ-JPN | 2004 | Sting Japan |
| Sony PlayStation 2 disc | Road Rage 3 Model SLES-51930 | 2004 | Phoenix Games |
| Slot Machine | Road to Riches | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Nintendo GBA cart. | Road Trip - Shifting Gears Model AGB-A6RE-USA | 2004 | Conspiracy Ent. Corp. |
| Nintendo GameCube disc | Road Trip - The Arcade Edition Model DOL-GROE-USA | 2004 | Conspiracy Ent. Corp. |
| Sony PlayStation CD | Robin Hood - The Siege Model SLES-04110 | 2004 | Phoenix Games |
| Video Slot Machine | Robin's Adventure | 2004 | Amcoe, Inc. USA |
| Video Slot Machine | Robin's Adventure 2 | 2004 | Amcoe, Inc. USA |
| Sony PlayStation CD | Robocod - James Pond II Model SLES-04112 | 2004 | Play It |
| Pachinko | RoboCop Model J | 2004 | Okumura Japan |
| Commodore C64 disk | Robot 001 Hb | 2004 | Scserbin, Zoltan |
| Video Slot Machine | Rock Climber | 2004 | Igrosoft |
| Slot Machine | Rock On! | 2004 | GTech Corp. Providence, RI, USA |
| Slot Machine | Rock the Croc | 2004 | AGI Austrian Gaming Industries Novomatic Group |
| Slot Machine | Rocket Riches | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
