Constructor is a building game, and so the purpose is to build buildings, make cash, and complete a series of objectives. You have only five maps to play on, though, which is a major disappointment. Constructor is very humorous and doesn't have a shred of seriousness, so if you dislike funny games this is not for you.
The game is deep and has many features, including the option to use police, mobsters and gadgets to help you to defeat your opponents and make your residents happy. If your residents become unhappy, they will leave and stop bringing in cash and extra workers (who build buildings and can be converted into repairmen and gangsters) and tenants (who populate your buildings). Workers can also take over buildings and attack enemy workers. Repairmen have the sole task of repairing your buildings, whereas gangsters can attack enemies much more effectively than workers and are the only people who can attack buildings.
The AI is extremely ruthless and will not hesitate to build on your land, take it over, destroy your buildings, and generally wreak havoc. The graphics are exceptionally made for such a primitive engine. The sound is nicely done, although it isn't of the highest quality. This game is fun, because it oozes charm and is surprisingly addictive once you get into it.
Constructor has several downsides as well: While the interface is generally easy to use, it has an extremely annoying omission -- you cannot use the right mouse button to move your workers, which can get very annoying when you are trying to build up an area quickly before the AI moves in. Also, the game does not have much variety, and once you exhaust the initial charm and fun, it quickly becomes boring.
Overall, Constuctor is an extremely fun game while it lasts. It works well in DOSBox, but make sure you disable the video animations, as some are missing from the archive.
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