Despite the IIGS' stock standard speed of 2.8 Mhz and no dedicated graphics hardware to push the pixels, action games outnumber any other type of game available.
Aaargh!
Airball
Alien Mind
Ancient Glory
Arkanoid
Arkanoid II
Bouncing Bluster II
Bubble Ghost
Cavern Cobra
Crystal Quest
Dark Castle
Defender of the Crown
Firepower
Futureshock 3D
GATE
Gauntlet
Great Western Shootout
Hover Blade
Impossible Mission 2
King of Chicago
Laser Force
Last Ninja, The
Marble Madness
Mazer II
Out of this World
Paperboy
Qix
Rastan
Rocket Ranger
Sea Strike
Silpheed
Sinbad & the Throne of the Falcon
Space Ace
Space Fox
Space Shark
Task Force
Thexder
Three Stooges, The
Tunnels of Armageddon
Warlock
Xenocide