A swarm of monsters attack Fionna and Marshall Lee on their way to the prince’s party. Help them to eliminate enemies as many as you can. Click to kill enemies. Don’t let monsters pass you, otherwise you will lose energy. Hit multiple enemies to earn combos. When you earn enough money, you can buy weapons in the shop. The bar at the top shows your energy. This action game Adventure Time Fionna Fights is from www.flash-game.net.