| PC/MS-Windows pack. |  2048 Royal Cards Model 1665810 | 2021 | Steam Valve Corp. |
| MSX cart. | 2048 Simulator Hb | 2015 | Timmy |
| PC/MS-Windows pack. | 2048 Model 942050 | 20?? | Steam Valve Corp. |
| Nintendo 3DS cart. | 2048 Model CTR-JFEP-EUR | 201? | GameOn |
| PC/MS-Windows pack. | 2048x2048 | 2016 | Blaney, Loren |
| Sega Mega Drive cart. | 2048~16 Hb | 2014 | Titan |
| PC/MS-Windows pack. | 2051 AD. Your life Model 1609190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  2064 - Read Only Memories Demo Model 407040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 2064 - Read Only Memories Model 330820 | 20?? | Steam Valve Corp. |
| Acorn Archimedes disk | 2067 BC | 1992 | Oregan Dev. |
| Sharp X68000 Series 5.25in. disk | 2069 AD | 1991 | Home Data Japan |
| NEC PC-9801 Series 3.5in. disk | 2069 AD | 1991 | Home Data Japan |
| Fujitsu FM Towns disk | 2069 AD | 1991 | Home Data Japan |
| PC/MS-Windows pack. | 2076 Demo Model 1594080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 2076 Midway Multiverse Model 1508280 | 2022 | Steam Valve Corp. |
| PC/MS-Windows pack. | 2080 Apocalypse Model 1920930 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 2084 Model 987850 | 2018 | Steam Valve Corp. |
| Sinclair ZX Spectrum cass. | 2088 | 1988 | Zeppelin Games |
| Amstrad CPC cass. | 2088 Model A029 | 1988 | Zeppelin Games |
| Amstrad CPC 464 disk | 2088 Model A029 | 1988 | Zeppelin Games |
| PC/MS-Windows pack. | 2089 - Space Divided Demo Model 1674140 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 2089 - Space Divided Model 1653770 | 2022 | Steam Valve Corp. |
| PC/MS-Windows pack. | 20b Model 1689730 | 2022 | Steam Valve Corp. |
| Fruit Machine | 20p Roulette | 2010 | Barcrest Games |
| PC/MS-Windows pack. | 20Something Model 582840 | 2017 | Steam Valve Corp. |
| Redemption mechanical game | 20th Century Digger | 1933 | ESCO Exhibit Supply Co. Chicago, IL, USA |
| Coin-op Misc. game | 20th Century Prospector | 1900 | Columbia Novelty Mfg. Co. Chicago, IL, USA |
| Panasonic 3DO CD | 20th Century Video Almanac | 1993 | Software Toolworks, The |
| PC/MS-Windows pack. | 20XX Model 322110 | 2017 | Steam Valve Corp. |
| Arcade Video game |  21 | 1976 | Mirco Games, Inc. Phoenix, AZ, USA |
| Pinball | 21 | 1960 | Williams Mfg. Co. Chicago, IL, USA |
| Trade Stimulator | 21 | 1941 | Daval Mfg. Co. Chicago, IL, USA |
| Pinball | 21 | 1937 | Gottlieb & Co., D. Chicago, IL, USA |
| Pinball | 21 | 1935 | Rock-Ola Mfg. Corp. Chicago, IL, USA |
| Coin-op Misc. game | 21 | 19?? | Seidel Amusement Machine Co., Inc. Albuquerque, NM, USA |
| Videoton TVC disk | 21 | 198? | SiL Software in LUX |
| Orion-128 cass. | 21 | 19?? | Unknown Russia |
| Trade Stimulator | 21 - Army Game | 1934 | Pierce Tool & Mfg. Co. Chicago, IL, USA |
| Sega Dreamcast GD | 21 - Two One Model T-46503M | 2001 | Princess Soft |
| Sega Dreamcast GD | 21 - Two One Model T-46504M-1 | 2002 | Princess Soft |
