Astro Blaster
The Game: Another day, another alien invasion. But this time it won’t be so easy to fight the aliens off: your ship has a limited supply of power, and your guns can overheat if you force them to spend too much time blazing away. You have to be judicious with your firepower, dodge incoming fire, and hold out long enough to dock with your own mothership and refuel between waves. (Gremlin/Sega, 1981)
Memories: While Space Invaders “inspired” a glut of knockoffs since 1978, several games tried to improve upon the slide-and-shoot formula in later years: Namco‘s Galaxian and Nintendo‘s Radar Scope introduced dive-bombing attacks, Moon Cresta by Nichibutsu replaced the standard “three lives” system with a three-stage rocket, and Gremlin/Sega‘s Astro Blaster brought something else to the table to up the stakes: the game was based on the premise that any spaceship would have limited fuel and ammo. [read more]
The Game: You pilot a space fighter, bombing and blasting away at enemy ground installations, ships, and missiles. Strafe away! (Universal, 1981)
The Game: An oversized gorilla kidnaps Mario’s girlfriend and hauls her up to the top of a building which is presumably under construction. You are Mario, dodging Donkey Kong’s never-ending hail of rolling barrels and “foxfires” in your attempt to climb to the top of the building and topple Donkey Kong. You can actually do this a number of times, and then the game begins again with the aforementioned girlfriend in captivity once more. (Nintendo, 1981)
The Game: One or two players, using a control knob and a thrust button, pilot their ships around a rectangular arena which is also home to a floating fortress. At the heart of the deadly fortress is a growing Eliminator, which will eventually, when it reaches its full potential, slip its bonds and zip around the arena, destroying everything in sight. The only way to destroy the Eliminator is to force it into the outer wall of the fortress with your lasers. (This also works on your fellow player, or the computer-controlled second player surrogate, as well.) You can also fire a well-placed shot down the launch tube of the fortress and destroy it before the Eliminator can fully form. (Sega/Gremlin, 1981)
The Game: As an unnamed but cartoonishly cute little hero, you are powerless to watch as your girlfriend Cheri is abducted by a boatload of pirates. Only then are you inspired to act, chasing after the heavily armed pirate ship in your defenseless balloon. You dodge cannonballs as you try to reach the pirate ship’s landing pad (what is it, an aircraft carrier?!). Then you have to battle those nasty pirates on the deck of their ship while still dodging that pesky cannon, until you do away with them all and get to Cheri. A bird then scoops her up, leaving you to take a treacherous balloon trip, climb a tree teeming with dangerous critters, avoid tigers in the jungle, and take on an entire tribe of natives (who seem to be in cahoots with the pirates, who now have helicopters and artillery!) to rescue Cheri. Then, of course, she goes and gets herself kidnapped again. (Rock-Ola [under license from SNK], 1981)
The Game: You are a frog. Your task is simple: hop across a busy highway, dodging cars and trucks, until you get the to the edge of a river, where you must keep yourself from drowning by crossing safely to your grotto at the top of the screen by leaping across the backs of turtles and logs. But watch out for snakes and alligators! 
The Game: Tom the plumber smells a rat – actually, he smells a lot of them, and they’re all crawling around the plumbing, breaking pipes and planting bombs. While this is generally atypical rodent behavior, Tom only cares about knocking 
The Game: You are an unknown species of brightly-colored deep-sea fangly fish who appears to subsist on cherries and has range weapons, radar and a fuel gauge. (I did mention that this was an unknown species, didn’t I?) Smaller critters emerge from a handful of indestructible “spawn points” on the screen, represented by stuff like a star or a floating eyeball, and you must shoot these critters. A direct hit briefly turns the critters into cherries, which float downward until your fish eats them (and, in so doing, replenishes his fuel), or they revert back to being critters. Un-cherry-fied critters can kill your fish, as can physical contact with their spawning points or running out of fuel. (Movement costs fuel, as does firing your fish’s weapon.) You advance by turning every critter in the screen into cherries and eating them. If you lose all of your fish, that’s the end of the game. (Sun Electronics, 1981)