Heavy pens hit harder. Low-grip pens slide further before they stop. Long pens reach more of the desk but are a bigger target.
Win a best-of-three to move up the desk. Every rival you beat hands their pen over.
How much of a fight do you want?
Two pens, one desk. No walls, no edges to hide behind.
On a keyboard: ← → turn, ↑ ↓ power, Space flick, R replay the round.
Later desks have clutter on them. A notebook drags a pen to a stop. An eraser, a sharpener or a ruler will bounce you clean off course, so learn to use them.