Methods, systems, and computer programs are presented for executing a game. One method includes an operation for detecting a petition for help from a first player to a second player to obtain a first game asset for the first player. The petition is sent to the second player notifying the second player that a game asset needed by the second player would be awarded to the second player for helping the first player. Further, the method includes operations for detecting that the second player has performed a game operation to help the first player based on the petition, and for determining a second game asset that the second player needs for making progress in the game in response to the game operation to help. After the determination, the second game asset is awarded to the second player.