Doom II screen saver

The Doom II screen saver is an officially licensed product created by for id Software. It consists of a Windows 3.1 and up 16-bit with four different modes: Skeet, Firework, Barrel, and Duel.

Skeet
An arch-vile at the bottom left corner of the screen waits for monsters to march in from the right. It launches the monster into the air with its flame attack, while the Doomguy raises either the shotgun or chaingun at random from the bottom of the screen to take a potshot at the monster. Occasionally the Doomguy misses, leaving the desktop gradually more and more riddled with bullet and buckshot holes.

Firework
Monsters and marines randomly ascend from the bottom of the screen and explode into more copies of the same monster, with accompanying highly repetitive "ooh" and "ahh" sounds emanating from an unseen crowd.

Barrel
The desktop is randomly littered with explosive barrels, which the Doomguy attempts to shoot in time to kill the monsters, who sometimes escape unscathed. During this mode, other random events also occur, such as a flock of lost souls crossing the screen, Doom marines pressing switches which drop them into holes or mysteriously cause them to gib, and monsters emerging from portions of the desktop which open up and then close like doors.

Duel
Two random monsters emerge and do battle across the desktop. The pairings often result in unlikely victories, such as a shotgun guy defeating a revenant. Nothing ever seems to beat the almighty cyberdemon, however.

Technical
System requirements:
 * Windows 3.1 or higher.
 * 486DX 33 MHz or higher.
 * 8 MB RAM.
 * 25 MB hard disk space.
 * VGA video.
 * Sound Blaster or compatible sound card.
 * 2x CD-ROM drive for CD edition, or 3.5" floppy drive.

Note that the program will not install on Windows XP or higher due to bugs in the installer program. It also cannot be installed or executed on 64-bit editions of Windows, due to being a 16-bit process. The program is also dependent on the speed of the CPU, and will run unreasonably fast even on relatively old processors such as a Pentium II.

Disk checksums

 * Doom II Screensaver* was distributed on four floppy disks. Their contents have the following SHA1 checksums:

ed8d910732d8f6392cb5442fc45aaa3572ccc1d2 doom_screensaver_disk1.iso 0438ac4f120b6ff5d3a2315913c7e314f540ce26 doom_screensaver_disk2.iso 1128e2c1d92a8fdf211bf784e8a4da16f7727115 doom_screensaver_disk3.iso 1d8b6a1ca9b397b96b2e13d75037ea9ff248f51b doom_screensaver_disk4.iso