Complete process of building this game is described step by step in this free to read book:
Before installing, make sure you have:
gem install rmagickshould work).
To install it, run
$ gem install tank_island
There are several ways to start the game.
$ w=1600 h=1200 tank_island
$ fs=1 w=1200 h=800 tank_island
Dmoves your tank.
ESCgoes into menu and away from it.
Rrespawns your tank.
Tspawns an enemy tank under mouse cursor.
F1enters debug mode.