| Walter Payton Football | US | 1990 |
Sega | Commercial |
| Wanted | BR | 1989-08 |
Sega | Commercial |
| Wanted | EU | 1989-11 |
Sega | Commercial |
| Wanted | US | 1989-08 |
Sega | Commercial |
| Waternet | WORLD | |
| Unlicensed |
| Weka Invaders | WORLD | |
| Unlicensed |
| Whack 'Em Smack 'Em Byrons Remarked | WORLD | |
| Unlicensed |
| Where Is It | WORLD | 2023-09 |
SMS Power! | Unlicensed |
| Where in the World is Carmen Sandiego | BR | 1989 |
Parker Brothers | Commercial |
| Where in the World is Carmen Sandiego | US | 1989 |
Parker Brothers | Commercial |
| Wimbledon | BR | 1992-05 |
Sega | Commercial |
| Wimbledon | EU | 1992-05 |
Sega | Commercial |
| Wimbledon II | BR | 1993 |
Sega | Commercial |
| Wimbledon II | EU | 1993 |
Sega | Commercial |
| Wing Warriors | WORLD | 2024 |
EGS | Unlicensed |
| Wing Warriors | WORLD | 2024 |
EGS | Prototype |
| Winter Olympics | BR | 1993 |
U.S. Gold | Commercial |
| Winter Olympics | EU | 1993 |
U.S. Gold | Commercial |
| Winter Shooter | WORLD | |
| Prototype |
| Wolfchild | BR | 1993-09 |
Virgin | Commercial |
| Wolfchild | EU | 1993-09 |
Virgin | Commercial |
| Wolfenstein | WORLD | |
| Unlicensed |
| Wonder Boy | BR | 1987-03 |
Sega | Commercial |
| Wonder Boy | EU | 1987-03 |
Sega | Commercial |
| Wonder Boy | JP | 1987-03-22 |
Sega | Commercial |
| Wonder Boy | US | 1987-06 |
Sega | Commercial |
| Wonder Boy III - The Dragon's Trap | EU | 1989-09 |
Sega | Commercial |
| Wonder Boy III - The Dragon's Trap | US | 1989-09 |
Sega | Commercial |
| Wonder Boy III - The Dragon's Trap | WORLD | 1989-09 |
Sega | Commercial |
| Wonder Boy in Monster Land | EU | 1988-01 |
Sega | Commercial |
| Wonder Boy in Monster Land | EU | 1988-01 |
Sega | Prototype |
| Wonder Boy in Monster Land | US | 1988-08 |
Sega | Commercial |
| Wonder Boy in Monster Land | US | 1988-08 |
Sega | Prototype |
| Wonder Boy in Monster World | EU | 1993-08 |
Sega | Commercial |
| Wonder Boy in Monster World | EU | 1993-08 |
Sega | Prototype |
| Wonder Kid | KR | |
| Unlicensed |
| Wonsiin | KR | 1991 |
Zemina | Unlicensed |
| Woody Pop - Shinjinrui no Block Kuzushi | JP | 1987-03-15 |
Sega | Commercial |
| World Class Leaderboard | BR | 1991 |
U.S. Gold | Commercial |
| World Class Leaderboard | EU | 1991 |
U.S. Gold | Commercial |
| World Cup Italia '90 | BR | 1990-12 |
Sega | Commercial |
| World Cup Italia '90 | EU | 1990-12 |
Sega | Commercial |
| World Cup USA 94 | BR | 1992 |
U.S. Gold | Commercial |
| World Cup USA 94 | EU | 1994-06-03 |
U.S. Gold | Commercial |
| World Games | BR | 1989 |
Sega | Commercial |
| World Games | BR | 1989 |
Sega | Prototype |
| World Games | EU | 1990 |
Sega | Commercial |
| World Games | EU | 1990 |
Sega | Prototype |
| World Grand Prix | BR | 1986-10 |
Sega | Commercial |
| World Grand Prix | BR | 1986-09 |
Sega | Prototype |
| World Grand Prix | EU | 1987-11 |
Sega | Commercial |
| World Grand Prix | US | 1986-10 |
Sega | Commercial |
| World Grand Prix | US | 1986-10 |
Sega | Prototype |
| World Soccer | BR | 1987-07 |
Sega | Unlicensed |
| World Soccer | WORLD | 1987-07-19 |
Sega | Commercial |
| X-Men - Mojo World | BR | 1996 |
Tec Toy | Commercial |
| Xenon 2 - Megablast | EU | 1991-11-21 |
Image Works | Commercial |
| Xenon 2 - Megablast | TW | 1991-11 |
Image Works | Unlicensed |
| Xyzolog | KR | |
Taito | Unlicensed |
| Yewdow | WORLD | |
| Unlicensed |
| Yokai Ninja | WORLD | 2025-04 |
ichigo/2minds | Unlicensed |
| Ys | JP | 1988-10 |
Sega | Commercial |
| Ys - The Vanished Omens | BR | 1988-10 |
Sega | Commercial |
| Ys - The Vanished Omens | EU | 1989 |
Sega | Commercial |
| Ys - The Vanished Omens | US | 1989-03 |
Sega | Commercial |
| Yuyryeong-ui Jip | KR | 1986-04 |
Sega | Unlicensed |
| Zaxxon 3-D | WORLD | 1987-11 |
Sega | Commercial |
| Zaxxon 3-D | WORLD | 1987-11 |
Sega | Prototype |
| Zemina Best 25 | KR | |
| Unlicensed |
| Zemina Best 39 | KR | |
| Unlicensed |
| Zemina Best 88 | KR | |
| Unlicensed |
| Zemina Rompack - Q-Bert + Sports 3 + Gulkave + Pooyan | KR | |
| Unlicensed |
| Ziggurat 3D | WORLD | 2026-03 |
SMS Power! | Unlicensed |
| Zillion | BR | 1987-05 |
Sega | Commercial |
| Zillion | EU | 1987-10 |
Sega | Commercial |
| Zillion | JP | 1987-05-24 |
Sega | Commercial |
| Zillion | US | 1987-11 |
Sega | Commercial |
| Zillion II - The Tri Formation | WORLD | 1987-12-13 |
Sega | Commercial |
| Zillion II - The Tri Formation | WORLD | 1987-12-13 |
Sega | Prototype |
| Zombi Terror | WORLD | |
| Unlicensed |
| Zool - Ninja of the 'Nth' Dimension | EU | 1993 |
Gremlin Interactive | Commercial |
| robotfindskitten | WORLD | |
| Prototype |