We participated at HackTM, a local hackathon with no real plans, other than having fun, drink beer and play with WebSokets.
After a couple of hours, we decided we want to create a multiplayer game, where each player must use their phone’s gyro sensor. So we came up with a simple concept: Have a blackboard, where players can join via any mobile browser and move their pulsating dots around the blackboard. The idea was not to collide with other dot trails, or else you die. The last man standing, wins.
Unfortunately, we didn’t have time to implement the colliding and scoring mechanics, but we had fun, and strengthen our team spirit.