Here is an update to nTris-sdl with the following features:
 1. sdl key auto-repeat as suggested by hoffa in a previous post.
 2. support for dynamically changing the background. Use the 'key_b' to get something like shown below:
  
In principle, you can add as many backgrounds as you like. I provide 4 samples. Make sure they are transferred to the same folder as the executable.
3. LBNL, i've also cleaned up the source code. So it should be more readable now.

That's it. Cheers,

Could you post a zip file again? Or a .tns file? Sorry mac

For Mac, http://www.unrarx.com/ is great ;-)

That game looks so old school that just that seems to make it even better. I wonder if there has been any updates recently? (I haven't gotten time to check the topic until now. I might try it later if I have more free time)