Rubyist since 2000 (Ruby 1.4.6). Works for Network Applied Communication Laboratory. Is not a Ruby committer. WebAssembly is a state-of-the-art technology to run CPU intensive calculation on the browser. So how does it relate to Ruby? Well, for instance, you would like to use it while writing browser games, with Ruby. In this talk, I will introduce DXOpal, a game programming framework for Opal (Ru