Obstacles and DCs

When preparing your subsystem, think of the obstacles PCs might face or avenues they can exploit when engaging in your subsystem. Set some DCs for them in advance, using the normal system for setting DCs. Everything else, you can improvise on the spot. If you think your DCs will be higher overall, when you set the number of points needed, choose a value on the lower end (see Setting your Scale). Think of some possibilities that are much easier and some that are harder. Who are your PCs opposing, and what weak points might that opposition have that the PCs could exploit? Set those DCs lower or make overcoming them grant more VP. PCs who do their research or come up with clever strategies should find it easier to overcome the challenge.