I have an idea for a basic gameplay:
In the game there would be you, your team, them, there team and a assortment of neutral creatures.
You would try to complete a task before the other team such as race to a checkpoint or kill the most creatures.
You can also kill the other teams players while completing a task.
There would be alot of weapons that can be upgraded when going to a "upgrade point" and bring money or something like that.
There would be vehciles placed around the map, they would not do anything until a player gets inside.
This game can be single-player,multi-player or co-op.
Please feel free to comment on my ideas.
From the office of... Dr. Schnitzengruber