Round 42 description
Not the first, but rather the original version of Space Invaders game. We again manage in the bottom of the screen the gun, which each of the 42 levels must shoot enemies moving across the screen from right to left.
The gun has two kinds of ammunition, the attack which is made by pressing different buttons: one for ordinary and infinite ammunition, the other for phaser's, much more powerful, but limited number. However, for every 7500 points earned on a level will give you new phaser and one additional "life". One of the interesting features of the game is to provide not only indicated even in its title big (for those times) the number of levels, but that at each level the enemy is completely different: it could be birds or, say, funny men; however, they move and attack in different ways. Also worth noting is the presence of bonus levels that begin after successful completion of four levels: on them you have to fly through the maze, moving left and right and trying not to collide with the walls.
The graphics in the game is almost nonexistent, but it's not so bad. But the sound here is quite unusual, even compared with much more "advanced" games in those years, but it, of course, is not to describe. In principle, something revolutionary in the game, but fans are not the most trivial of options SI need to stay happy.
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Source: Archive.org, Mobygames.com