I would like to provide some info about this game

It is develloped by the ufo2000 development team, you may see credits for the game in the AUTHORS file on the game's root. (You can open it with Notepad).

The game is still under development and is open source, the development team is working hard to add new features, correct bugs and give players a refreshing game.

The lastest beta versions do not require original versions of X-com Ufo Defense and Terror from the Deep anymore but it's recommended to have them since most maps are still based on their data files.

A lot of progress has been made recently and more is to come. New maps have been added. We got new Aliens such as Snakemen, Floaters and Etherals (requires original game). Support for new weapons have been added, now you can even design your own equipment set and use it (as long as the other player has it too).

Support is for both hotseat (turn based on the same computer), LAN, and internet.

Have fun!