Edit: Unbelievably, Digital Arrow’s beta sign up page was just the victim of a flood attack, and 200 sign ups were lost. If you signed up in the last hour or two, you might want to fill in the form again.

Edit again: The computer whizzes have managed to recover all lost entries. There’s now no need to resubmit.

In Momentum, the really splendid jumpy-bouncy game from indies Digital Arrow, has just begun its multiplayer beta. Lots has changed since I last had my hands on code, with a new HUD, difficulty levels, and rebalancing of the movement. And if you want to experience it for yourself (Windows users only) – and I think you ought – head over here and apply. The twenty testers Digital Arrow deem to have been the most helpful in this process will receive a free copy of the game. And make sure to read our preview of what we think could be a smash.