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However, as most roguelike games, ADOM is definitely not for everyone. First of all, the whole interface is based on ASCII characters. This is a mixed blessing: it means you won't get any pretty graphics, but you'll be able to identify what's on the screen quickly and easily. Secondly, the large amount of possible commands may seem overwhelming at first, but of these dozens of commands, only a few are used constantly, so learning them should be not too hard. Also, ADOM can be very difficult in the beginning, until you've managed to learn a few basic tactics. Don't let that discourage you, the game is very enjoyable once you are comfortable with the interface and learned to survive in the beginning.
ADOM is one of the best games I ever played. Managing to overcome the lack of visual images by using incredible gameplay is a feat in itself. If you never had the opportunity to try any Roguelike games, then by all means start with this one. You won't be disappointed.