ESWAT: City Under Siege (JP: Cyber Justice: ESWAT) is a Sega Arcade side-scrolling shooter that was released to the Sega Genesis the following year with numerous tweaks. The original Arcade version was also converted for many home computers and consoles of the late 80s and early 90s. The Genesis version of ESWAT was also later added to the 2009 Sega compilation Sonic's Ultimate Genesis Collection as well as joining several other Genesis titles on Steam.
ESWAT features the cop Duke Oda as he makes his way through the ranks of a futuristic police force, eventually donning the ESWAT power armor that turns him into an almost unstoppable crimefighter. Standing in his way is the terrorist organization E.Y.E., which is determined to bring down ESWAT at any cost with equivalent hi-tech gear.
The game changes as the player progresses, evolving from the moderately underpowered patrolman to the ESWAT cyborg and adopting new weaponry and powers along the way. The game plays similarly to other Sega side-scrolling games of the era, such as Shinobi.