4X games that still hold up

Sid Meier's Civilization 1991

On sale Sid Meier's Civilization V 2010 $6.44 on Fanatical -79%

Sid Meier's Civilization II 1996

On sale Mount & Blade: Warband 2010 $4.99 on GOG -75%

On sale Sid Meier's Civilization IV 2005 $5.24 on Fanatical -83%

On sale Sid Meier's Alpha Centauri 1999 $0.99 on GOG -83%

Master of Orion II: Battle at Antares 1996

Master of Orion 1993

On sale Master of Magic 1994 $2.99 on GOG -50%

Cataclysm: Dark Days Ahead 2013

On sale Sid Meier's Colonization 1994 $0.89 on GOG -85%

On sale The Battle of Polytopia 2016 $4.49 on Fanatical -70%

On sale Medieval: Total War 2002 $1.79 on Fanatical -82%

Centurion: Defender of Rome 1990

On sale Sins of a Solar Empire 2008 $3.99 on GOG -60%

The Settlers: Fourth Edition 2001

On sale Endless Space 2 2017 $9.99 on GOG -75%

On sale Sid Meier's Civilization III 2001 $1.19 on GOG -80%

On sale Sid Meier's Civilization VI 2016 $5.09 on Fanatical -92%

On sale Age of Wonders II: The Wizard's Throne 2002 $8.99 on Fanatical -10%

On sale Empire: Total War 2009 $4.49 on Fanatical -78%

On sale Stellaris 2016 $14.99 on Steam -70%