Into The Void Event (Closed; Ended)
The event has begun. Similar to the Pirate event, there's three types of levels: Blue, Purple and Yellow portals. Each has a number of wave battles inside against whatever the crossover games' characters are (little dragons? a Pokemon ripoff? I dunno).
Interesting, the wave battles in the Purple and Yellow portals have victory wheels at intervals (the wheel you spin upon winning a battle). Each has a different color star inside it. I believe this refers to the quality of reward, i.e. the longest wave battle has the best rewards at the end. If you die early in the wave battle, but after getting to one of the victory wheels, you can still spin, but for a worse reward. I haven't lost a battle to test this theory.