Found two more password saves.

Chuck Rock: SEGA Game Gear

Early(?) 90s

Round 2: 7G09M

Round 3: NN6E3

Round 4: 84AKC

Choplifter 3: SEGA Game Gear

90s

Sector 2 lvl 1: YLDNXJS

sector 3 lvl 1: DSNVSDK

Sector 4 lvl 1: HSDNJND