Water Warfare! Not THAT bad!
Battle Royale: The last man/woman standing wins.
Death Match: Not sure why it's still called "death" match, but this is the standard FPS free-for-all you're used to. First player to 10 knockouts wins.
Treasure Chest: Find the opposing team's chest and bring it back to your base, but defend your own chest.
Assault: Capture the flag.
Base: Take control of bases and score 100 points to win.
Point rally: Put your gun away and race through checkpoints.
One thing I don't like about this game is that whatever terrain you're on, your footsteps are the same. I also hate how long it takes you to soak someone with water! But it is a fun FPS for kids. There's online play, too. You can play with people in your nation or in the world. I would recommend this game for parents buying there kids a game.