Threshold
Threshold is a space combat-themed fixed shooter written by Warren Schwader and Ken Williams for the Apple II and published by On-Line Systems in 1981. The game was heavily influenced by Sega's Astro Blaster arcade game. Ports to other systems were all released on ROM cartridge: Atari 8-bit family and Commodore VIC-20 in 1981, Commodore 64 in 1983, and ColecoVision in 1984. An Atari 2600 adaptation was published by Tigervision in 1982.
The player controls the spaceship Threshold, using its laser weapon to destroy waves of alien attackers. When a wave is eliminated, another appears. As in Astro Blaster, firing the laser increases its temperature, and it cools down when not being used. If the temperature bar fills completely, then the weapon cannot be used until it fully cools. Once per ship, pulling back on the joystick activates a 'warp drive' that slows the action down.
How to play:
Click on the joystick icon in the Threshold online emulator to see how to control the Threshold game
Comments