One should be able to create their own gem for adding additional towers to ruby-warrior. When the user runs the rubywarrior command it will look through the gems and add any towers mentioned.

Third party towers should be able to extend the units and abilities as well.

One interesting ability would be "warrior.golem!" which would spawn a separate character in front of the warrior. It would be weaker than a warrior and have fewer abilities. This would be a good use for a block in Ruby to control the golem's actions each turn.

warrior.golem! do |golem|
  golem.walk!
  #...
end

Likely only one golem could be made at a time. Also maybe it should have some bad consequences like cut the warrior's health in half?

What do you think of this idea? Would it be too confusing? What would be the best way to express which abilities the golem has?

Add a leader board to http://rubywarrior.com. Provide a documented way to submit the code to the site to be run, perhaps with a post-commit hook URL one can use in github to frequently re-run the code when levels/player is updated. It can record user's current progress through the levels and their score.

One challenge is how to run the code in a protected environment. We don't want any arbitrary ruby code to run, especially code that effects the file system or executes system commands. Look into _why's sandbox gem for this?