Welcome to the forums @Tom_in_Taiwan!
A few questions:
Is the game 2D or 3D?
What perspective does the game use?
Top-down, side-scroller, etc.
Do you want to use the physics engine or control it through code?
That would help with answering the question. Without knowing more, it is hard to know what to point to or what to suggest, simply because there are so many different possibilities.