Another dumb question from the bloodhammer

[CromoftheBloodhammer]

So, if I start to find that my PCs are having too easy of a time what is the proper way to make my game more challenging? Should I just pump CR or do I beef monsters individually? What are some of the better techniques out there?

[Altus Lucrim]

How are they having too easy of a time? Describe your dud encounters.

[CromoftheBloodhammer]

They seem more powerful thqn their APL, too apt to be fighting what they are fighting,

[Kiinyan]

Could you give us a sample encounter?

If you want to increase difficulty without increasing CR abuse terrain. Put 50ft of difficult terrain between the PCs and a couple of archers and casters. Underwater incorporeal creatures are complete agony.