ESWAT: Cyber Police is the original version, released in 1989 for the arcades. It is tactical action platformer in the vein of Rolling Thunder and Shinobi, featuring a similar focus on careful positioning and managing your limited ammo. It was later ported to the Sega Master System and several western computer platforms.
The second game, ESWAT: City Under Siege was released in 1990 for the Sega Genesis. Though also an action platformer, the game features vastly different level design, enemies and play mechanics. Whereas getting the ESWAT suit in the original didn't change much beyond giving you a machine gun and the ability to use ammo-limited special weapons, the suit here has a Jetpack and a full arsenal of switchable weapons, both of which need to be used in conjunction to clear the levels. Unlike the arcade version, it wasn't ported to any contemporary system, though it was included in a Compilation Re-release.
Tropes that apply to both games
- Degraded Boss:
- In both versions, the cyborg twins reappear as weaker midbosses near the end of the game.
- In a series-wide example, the hovercraft pilots are a pair of (rather weak) stage bosses in Cyber Police. In City Under Siege, they become generic enemies in one level.
- Denial of Diagonal Attack
- Dual Boss: The cyborg twins.
- Second Hour Super Power: After a certain point in both games (catching the three bank robbers in Cyber Police and beating the twin cyborgs in City Under Siege), Duke is promoted to chief rank and gain clearance to the ESWAT armour.
- Reformulated Game: Both games have entirely different level designs and visual design, with City Under Siege being noticeably futuristic than the original. The Sega Master System version also has different level design, though it doesn't stray as much from the arcade version as City Under Siege does.
Tropes exclusive to Cyber Police
- Car Fu: One of the bosses is a truck that occasionally charges at you.
- Clothing Damage: The ESWAT armor gets visibly damaged every time you get hit.
- Groin Attack: The second level boss was an extremely tall enemy with a boomerang and a hostage he used as a Human Shield, so you normally had to jump to shoot him when he stood up behind her. However, if you were completely out of bullets, you could walk through the hostage and give him a kick to the family jewels, resulting in a One-Hit KO.
- Yellow Peril: Rat Lee.
Tropes exclusive to City Under Siege
- Mirror Boss: The final boss is an Evil Knockoff of the ESWAT suit, which possesses most of your abilities.
- Outranking Your Job: You get promoted rather quickly from Patrolman (or Sergeant) to Captain to Chief of Police and finally to Eswat, yet you are alone on your missions and do not command anyone else during the game. Also, what an odd promotional system where you have to be named Chief prior to being promoted to Eswat, which seems to imply that all Eswat officers outrank their boss (unless there is a Police Commissioner who outranks Eswat, if not the Mayor who is in charge) and were all named the Chief of Police prior to joining the Eswat division of the police department!
- Power-Up Letdown: Getting the Swat armor actually makes the game harder more than it helps you, since your hitbox is now too big to avoid shots by crouching, and you can't really shot bullets out of the air like you could before.
- Prop Recycling: The police car sprite in the ending is taken from the first Streets of Rage