Splatball's sign.
Splatball is one of the 4 games in Onverse, It is similar to Paintball. Splatball is very fast paced and fun. Also you can earn Player Points (PP) by shooting others. You can collect guns and there are 2 different Areas, Beginner and Expert. There is also a gift shop and in my mind is very fun.
The song that is playing in this area of the game is "More Than I Thought" by Fugue State.