Draw lines, conquer as much land to go to the next level. Volfied is a game that should definitively been on your "Top 10 DOS arcade games" list. It's a fun and addicting game. I remember playing this game for hours when I was young and played it on my second computer. The game is basically an updated version of Qix, with extra features and a futuristic science fiction aesthetic, rather than Qix's abstract geometry style. The player pilots a small spaceship named "monotros" instead of a simple dot and the enemies come in the form of various aliens. The opening cutscene before the first level pretty much give a synopsys of the story. Volfied takes place in an alternate galaxy, where a planet call Volfied is being attacked by an unknown alien force. It's up to you to save the planet and its inhabitants. The gameplay is rather simple: use your shit to claim most of the game screen by drawing a line from edge to another/same edge. Once you have claimed at least 80 percent of the screen, you have completed the level. However, there are some alien ship that will make your task difficult. If they manage to touch your ship while you're drawing the line, it destroys you. There are some helpful power-ups in the game, like speed and laser. The graphics are quite good, but the music in the DOS version is awful. It's so bad that it makes you turn down your speakers. Overall, Volfied is a solid arcade game and addicting as well.
Check inside the game for instructions on how to play volfied. Once in the game, using the arrow keys you can move the 'Scanner' ship around the 'Shield Line' at the parameter of the playing area. While moving around this edge the ship is protected from the aliens by a shield indicated by a glowing circle around the ship. This shield is not infinite and care should be taken to complete each level as quickly as possible. A counter indicates the level of shield that you have: when it reaches zero then any contact with an alien is deadly whether you are on the 'Shield Line' or not.
The idea of the game is to cut areas out of the screen without touching any of the aliens. This is done by pressing the SPACE key which initiates the 'Laser Cutter' and moving off the 'Shield Line' and rejoining it somewhere else. While you are in the process of drawing a line, your shield is inactive and touching an alien is fatal. Similarly, if one of the aliens touches the line then it will send a charge down the line towards you and you must quickly return to the safety of the edge before it reaches you.
When you rejoin the 'Shield Line' the area that does not contain the 'Boss' alien will be filled (points are gained by trapping the other aliens) and the 'Shield Line' will be adjusted to surround the area that is left. The level is completed when a certain percentage of the total area has been filled in. This percentage starts at 80% but may increase in the later levels.