Genghis Khan, original full title Aoki Ōkami to Shiroki Mejika: Genghis Khan (蒼き狼と白き牝鹿・ジンギスカン?), is a 1987 turn-based strategy game developed by Koei, originally released for the NEC PC-9801,[1] MSX and Sharp X68000 in 1988,[2][3] the DOS and NES in 1989,[4][5] and the Amiga in 1990.[6] It is actually the second game in the series, after a 1985 Aoki Ōkami to Shiroki Mejika, also for PC-88, PC-98, and MSX.

Liberty or Death is a turn-based strategy video game for DOS, Super NES and Mega Drive/Genesis released by Koei in 1993. Liberty or Death is part of Koei's Historical Simulation Series.

Nobunaga's Ambition (信長の野望 Nobunaga no Yabō?) is a series of turn-based grand strategy role-playing simulation video games. One of the first games in its genre, it was first released in March 1983 by the Japanese video game developer Koei.Games in the franchise have been released on a variety of gaming platforms, including the Nintendo Entertainment System, Game Boy, Mega Drive, 3DO Interactive Multiplayer, Super Nintendo Entertainment System, PlayStation, Sega Saturn, PlayStation 2, Virtual Console, PlayStation 3, Xbox 360, Wii, PlayStation Portable, PlayStation Vita and PlayStation 4. The title was also released for Macintosh as well as Amiga and computers with DOS-compatibility.

P.T.O. (Pacific Theater of Operations), released as Teitoku no Ketsudan (提督の決断?) in Japan, is a console strategy video game released by Koei. It was originally released for the PC-88 in 1989 and had been ported to various platforms, such as the Sharp X68000 (1990), MSX (1991), Sega Mega Drive and the Super Nintendo (both in 1992). Players could assume one side of the Pacific Theater of Operations during World War II, acting as naval commander, organizing fleets, building new ships, appropriating supplies and fuel, and even engaging in diplomacy with other countries. The player can choose one of several World War Two battles to simulate, or could control the entire Pacific campaign well before the Japanese attack on Pearl Harbor.A sequel, P.T.O. II, was released by Koei in 1995. Teitoku no Ketsudan III was never released outside of Japan, but a P.T.O. IV was released for the PlayStation 2 in the US and Europe.

Populous II: Trials of the Olympian Gods is a 1991 strategy video game in the Populous series for the Amiga, Atari ST and MS-DOS-based computers, developed by Bullfrog Productions. Populous II was remade and remastered for the Nintendo DS in 2008. Populous II is a direct sequel to Bullfrog's earlier game Populous and is one of the company's most notable games.Like its predecessor, Populous II is a god game, where the player is guiding his people in battle against the followers of an enemy god. Whereas Populous only generally alluded to undefined deities, Populous II is specifically set under the backdrop of Greek mythology. The player is a demigod, one of Zeus's countless children with mortal women, and has to battle one Greek deity at a time until finally facing his father. Zeus has promised to let the player into the Pantheon on Olympus if he can survive all the battles.A data disk was also released for Populous II, titled Populous II: The Challenge Games. This was set in Japanese mythology instead of Greek, and had each level as its individual challenge, slightly in the style of a puzzle game.

Rise of the Phoenix (項劉記, Kōryūki?) is a multiplatform turn-based historic strategy video game made by Koei for the Super NES/Super Famicom, NEC PC-9801, and Sony PlayStation console devices.