It's a game-challenge game in which you'll try to run the longest chain reaction of the molecules placed on the game field. Reagent slightly resembles the game "life" but still it's different. You can build a certain structure from the molecules and start a chain reaction like the domino principle or you can rely on the random and start the reaction from the position that is available at the moment. What is more profitable? You decide.
When the reaction is started you will observe how the structure of the molecules is ordered and your score points multiply. The longer the reaction and the more molecules involved in each iteration the more points you will receive. You can compete with your friends or take part in the global challenge by sending your results to the leaderboards via Google Play Games Services. You can track your personal progress in a special section where some statistics are displayed on your best achievements.
Perhaps for someone the game will have a meditative effect or it will just allow to somehow pass the time like a game-timekiller.
Do not forget that the more people take part in this challenge the more interesting this competition becomes so do not hesitate to tell your friends about this game.