How do I know it will run on my computer ?
     The Singularity Trap is PHP/MySQL and runs on a server.
     Windows users get it bundled with UwAmp to run off a thumb drive as a localhost/LAN server.
     Most operating systems - Windows also - can use Xampp as a server for localhost/LAN use.
Both of these are free. Try one out ahead of time.

Can UwAmp run off the main hard drive?
     Yes. It runs faster/smoother on the main hard drive. Flash thumbs can be slow sometimes, especially when creating a war.
If a flash thumb drive causes timeouts try a newer thumb or use a USB harddrive or copy to internal drive.

A note says: for your own use only - still covered by the use license - feel free to tweak as desired. Does this mean the code is in clear text?
     As clear as spaghetti. I was writing the code and the rules at the same time and never went back and cleaned up the code.
Not compiled or anything.

Why sell the prototype for $1.99 ?
     Mainly so a production version would have to be worthy of a higher price. The prototype is playable like a travel chess set is playable.
When an economy version exists, it should be available as an option.

Can you use it on a free web host ?
      Be wary of free hosts that throw ads or block access based on hits - chat and autoreload cause a hit every 10 seconds from that player.
Free hosts with a bandwidth limit should be fine since chat just reads a short text file and auto reload mostly uses the browser cache.