8. Battle Garegga
Release date: 1998
This Sega Saturn/Arcade vertical shooter is from the late '90s, but it's unique in that it trades colorful design and bullets for realistic shades and bullets that are shaded as they would be in real life. It's also got a system that increases the difficulty rank when players die. Players are forced to go through the game in a manner that keeps them underpowered and ultra-conservative. Think you're tough enough for it?