Fionna and Marshal Lee were on their way to Lumpy Space Prince's Party when a swarm of monsters attacked. Time to bust up some bad guys. With the gems you earn during your battle goto to the shop to purchase swords, potions and specials. When you attack as Fionna you need to try to line up more than one monster at a time so that you can hit a multiple amount of them. Adventure Time: Fionna Fights is one of our many Arcade Games that we publish on TheGamerStop.com. This game is also tagged as a Adventure Time game. Click the play button to start having fun. To play even more free games, view our popular and new games page. If you want to play more games like this, then you can simply check out the games inside the game tags that are the most relevant to your interests or the Arcade Games category or the games like this game page at the end of the game tags.