CorsixTH Beta4
A number of important gameplay features have been added in beta 4, which make CorsixTH feel more and more like a game, and not just a sandbox. This beta marks the threshold where most main features are in the game and it is time to start focusing more on improvements and fixing bugs. As always, if you're interested in helping with programming, translating, or artwork, then please get in touch.
http://th.corsix.org/