Area 51: Site 4 is a light gunarcade game developed by Atari Games in 1998, and sequel to the original Area 51, picking up where that game left off. Though the graphics have been improved, they rely on the same FMV streaming technology as the original, and the gameplay remains largely the same as the original game. The game is broken down into two big menus: field exercise and adventure. Field Exercise is the main mode of the game. The training levels are based on brief missions where the player must complete all "training challenges" and the "real mission" (in either order). Completing all the training challenges will involve shooting zombies that are contained in the labs, shooting giant maggots trying to burrow into sick patients in an infirmary, protecting a bus from aliens trying to roll it over, and destroying alien ships, turrets, and missiles. In the final mission, the player must go into a huge warehouse to destroy a giant red alien with multiple limbs, shooting zombies and aliens (and not shooting S.T.A.A.R. team members). After the game is beaten, a short sequence of clips are played involving S.T.A.A.R. members, ending with the message, "S.T.A.A.R. Wants You!" similar to the real-world Uncle Sam army recruitment posters. Players can lose lives by getting hit by the enemy or failing to complete a quota in this game. The intro is only seen in attract mode as an intro loop. The end credits can only be seen after playing without putting initials.
Players can lose lives by:
Letting the bus tip over where the player must protect it.
Shooting a STAAR member.
Failing to reach a quota.
Getting shot or meleed by enemies.
Letting the zombies hit the player where the player must hold back to.
Area 51: Site 4 is based on a PC, using a Cyrix MediaGX processor with the controls interfaced using a daughter board to the parallel port. The board uses a proprietary bios based on a tinyBIOS which loads a custom bootloader.