The darius port is based off a homebrew someone was working on. M2 took it over and polished it up. This is CONFIRMED. Having played the tetris port, it is HIGHLY accurate, with the extended features promised. The so called hard drop isn't isn't, though. it's simply a forced 1g drop with auto lock. Only difference is it doesn't have the poweron pattern that the arcade does. it is otherwise bug for bug compatible. it plays exactly the same.