Computer Space was the first arcade video game. Although it was conceived as a coin-operated version of Spacewar!, technical limitations caused it to end up as a less complex single-player game. It doesn't have ammo, fuel, or hyperspace travel, and there's no star in the center of the playfield. A version with a competitive multiplayer game mode was released a few years after the original.

The player controls a rocket ship, battling a pair of AI-controlled saucers for a certain amount of time. The ship can only accelerate forward and remains in motion. Rotating it left or right doesn't affect its course. A single missile can be fired at a time. It can be steered with the rotational controls and disappears after a while. The saucers aren't individual units and can also only have one missile, which does not deviate from its direction, in play. They move in formation, and both are destroyed when one of them is hit. Like the ship, they respawn in a random location shortly after being destroyed. Each hit scores one point. A collision, which wipes out all spacecraft, counts as a hit for both sides. The single-screen playfield wraps around.

Computer Space Simulator is a recreation of the original, which is difficult to emulate due to its hardware. It offers options for pretty much every parameter and fixes the scoring. Double-digit scores are displayed correctly, and reaching a score of 16 no longer resets it back to 0. The original game can be played indefinitely as long as the player's score is higher than that of the AI when the time runs out, the colors inverting after each game. This hyperspace mode isn't present in Computer Space Simulator, the game simply ends once the time limit has been reached.

Galaxy Game was the second arcade video game, its first prototype introduced to the public a few months after Computer Space. A second prototype was built, but the project wasn't commercially viable. Like Computer Space, Galaxy Game is based on Spacewar!. It's a faithful adaptation with options to change various gameplay elements. Its single-player practice mode doesn't have an AI opponent.

1001 Video Games You Must Play Before You Die #1

The Oregon Trail is an educational strategy game set in the year 1847. As an American pioneer, take your family from Independence, Missouri to Oregon City, traveling along the Oregon Trail in a covered wagon. Some of the starting money can be saved for later, but supplies are more expensive when bought at the forts along the way.

The start of each round either offers the option to hunt or, less frequently, to enter a fort where supplies can be restocked. How much food to consume must be decided next. A few random events follow, most of which are negative. With the exception of encountering riders, they don't offer any choices on how to proceed. When hunting or repelling attackers, one of several words representing a gunshot is displayed. The faster it's successfully entered, the better the outcome. The game ends if the principal character dies or when the destination is reached.