If the difficulty is too high, try lowering the game speed in the main menu.
Shooter, 1994Freeware, Source code
Shooter, 1997Shareware (installed), Shareware
Shooter, 1999Playable demo (installed), Full version, Extra
Shooter, 1999Freeware (installed), Freeware
Shooter, 2004Freeware (installed), Freeware, Source code
Shooter, 1996Shareware
Shooter, 1986Freeware (installed), Freeware, Source code
Shooter, 1996Full version
Shooter, 1994Shareware