Particle hosted a booth at the 2023 Bay Area Maker Faire and a possible prize was a fabulous electronic badge.

So, how does it work? Participants turn on their badge(s) and wait for the small LED to glow cyan, letting them know it’s ready for a game match to begin. The badge has four buttons, each serving as a launcher for virtual water balloons. Each button triggers attacks with varying strengths, all determined by a virtual die roll. Players take turns launching virtual water balloons, and after an attack and counter-attack, the badges will display the result of the match automatically. The badge lights up green for a win, red for loss, or blue for a draw. Players engage with fellow attendees in virtual water balloon battles, roll the dice, aim for high-strength attacks, and secure their win!

Players can only battle the same player up to 10 times (after which badges win glow white to alert you of the limit), so everyone must engage with new players to climb up the leaderboard.

Read more and see the code on GitHub.