Defly.io Coolmath game online is a great combination of Diep.io and Splix.io. In Defly.io hacked, you will pilot a helicopter around a big arena in order to gun down on various enemies before they shoot you back. Make sure you mark your realm by placing plenty of towers and walls on the map. Once you get your realm larger or pick up more kills, you will earn a huge amount of XP for yourself. Do your best to beat all opponents, keep your helicopter and buildings upgraded through over time then work your way to the top! Enjoy Cool Math game Defly.io now!