Control the swat with the mouse. Click mouse button to swat flies. Catch all 20 flies to end the game. The game now counts the number of swats and can measure your efficiency (as a percentage). So if you can swat all 20 flies in 20 swats you would be 100% efficient. It is theoretically possible to get better than 100% efficiency if you manage to swat more than 1 fly in a single swat, but so far I have only manged just over 42.5% efficiency. What can I say ... I write the games, doesn't necessarily mean I can play them well too!
Author: Tom Brough All artwork original of author using Inkscape. No (real) flies where harmed in the making of this game.