Popular games published by company On-Line Systems
A text based adventure game released in 1981 and has similar content to "Leisure Suit Larry in the Land of the Lounge Lizards" developed by Al Lowe which is based on "Softporn Adventure". It was ported to PC in 1991 and has also been included in some Leisure Suit Larry Collection editions.
You break into the mansion of the late millionaire Cranston in order to steal sixteen treasures which are said to be hidden within its walls.
An asteroid is on collision course with Earth and it's up to the player to prevent the inevitable catastrophe. "Mission Asteroid" is the third text adventure with graphical illustrations by Sierra. But due to its easy difficulty level it was released as number zero in Sierra's Hi-Res Adventure series. The game's parser only understands simple one- or two-word commands.
Princess Priscilla has been kidnapped and the player seems to be the only valliant hero willing to rescue the damsel in distress. This is the second text adventure with illustrating graphics released by Sierra. Communicating with the game works via entering commands which tell the player's alter ego where to go and what to do. Since the parser is a very basic one it only understands two-word commands. Two years after its initial release, the game was renamed "Adventure in Serenia" for its PC release. This suggested sequel was, however, exactly the same game as in its previous incarnation.
You are Ulysses and your king has given you the task of finding the legendary Golden Fleece and bring it back to him. In order to accomplish your king's wishes you travel through vast lands and meet many people and creatures from ancient Greek mythology.
Jawbreaker is a video game programmed by John Harris and released in 1981 for the Atari 400/800 by On-line Systems. Originally intended to be a fairly straight Pac-Man clone, Jawbreaker emerged as a relatively inventive version with unique gameplay. It was widely lauded by reviewers, and became a major seller for Sierra Online. The story of its creation forms a portion of Steven Levy's book, Hackers.
A compilation of 4 action games of various genres: Creepy Corridors, Mine Sweep, Apple Zap and Space Race.
Wizard and the Princess (1980), also known as Adventure in Serenia (1982), is an adventure game by On-Line Systems for the Apple II, Apple II Plus, and Commodore 64. It was the second title released in On-Line Systems' Hi-Res Adventures series after Mystery House. Wizard and the Princess is a prelude to the King's Quest series in both story and concept (though chronologically set several years before King's Quest V). It was also the first adventure game released with full color graphics. he game (according to the backcover (box/folder/manual) of the Atari 400/800 and Apple II original and rerelease versions) takes place in the land of Serenia where King George's daughter Princess Priscilla has been kidnapped by an evil wizard named Harlin. Harlin has held her inside his castle far in the mountains. The King has offered half of his kingdom to anyone brave enough to travel to the Wizard's castle, defeat him and return his daughter. The player assumes the role of a happy wanderer who answers this challenge. The re-releases (on Apple II, Atari 400/800, and the C64 port) contained additional plot added to the manual explaining how the wanderer made it to Serenia in the first place; some time long into the future after Harlin had been defeated by the Wanderer, he challenged the player to again repeat the actions leading to his defeat. He boasted of using his magic to change the world creating obstacles for anyone who would challenge him (he moved the desert around the village of Daventry, the northern sea splitting Serenia in two, and Great Mountains in the North on his half of the continent). He turned back the sands of time leaving the adventurer in the desert just outside the village of Serenia. He mocks the hero telling him that he may have been defeated once, but he couldn't be defeated a second time. The princess gives the hero some words of advice and a computer to help him defeat Harlin, and tells him he has become the wanderer (grandfather paradox & bootstrap paradox). The manual story as reprinted was also included with the Roberta Williams Collection (a compilation of games from Roberta Williams) and the King's Quest Collection Series (one of the compilations of King's Quest games). The introduction for Adventure of Serenia, explained that the adventurer, with the help of a computer, had magically transported to Serenia to save the Princess.
You are in control of a stationary gun turrent at the bottom of the screen. Planes drop bombs and paratroopers jump out of helicopters which you have to shoot. Every hit gains you points - every shot you fire looses you points. You have lost if a bomb destroys your turrent, a paratrooper lands directly on your turrent or four paratroopers land at any side of your turrent. In that case they are able to build a human pyramid to infiltrate your turrent and blow it up.
Introducing Pegasus II, a captivating variation of the classic Scramble game. Prepare for an exhilarating side-scrolling shoot 'em up experience as you navigate your ship across a majestic mountainous terrain. Engage in intense combat by strategically dropping bombs to obliterate enemy installations on the ground, while skillfully shooting down rockets with your ship's laser beams. Be prepared for aerial adversaries like birds, saucers, and dragons that emerge as you progress through the game. Remember, any contact with enemies or the ground results in a lost life, and you begin with five lives.
A clone of Missile Command for the Apple II.
In order to save Earth's future you are given a time machine enabling you to travel into several time periods of the distant past where you meet famous people like Robin Hood, Christopher Columbos or Cleopatra who will help you to change Earth's destiny.
Based on the movie of the same name you play the character of Jen, the last of the Gelflings. Your objective is to find the Dark Crystal and its missing shard before the Great Conjunction, the alignment of the world's three suns, takes place.
Marauder is a Berzerk-clone with some minor alterations. Similarly as in Berzerk you walk thorugh several screens shooting enemies. But contrary to Berzerk where you could see every enemy right from entering the screen; in Marauder the enemies only appear on the screen when they are in your line of sight. Therefore the player can be surprised by enemies much more easier. The ultimate goal of Marauder is to destroy the power center which has to be found by the player before the timer at the bottom of the screen runs out. After having destroyed the power center, the game starts anew on a harder difficulty level.
Threshold is a typical shoot 'em up that places the player's spaceship at the bottom of the screen where he has to fend of the enemy. If the player misses an enemy and he reaches the opposite side of the screen he will reappear on the other side of the screen again. This goes on as long as the player has destroyed all enemy ships and the game progresses into the next stage with enemies approaching in a different attack pattern. Needless to say that contact with an enemy projectile or an enemy itself results in losing a life.