What puzzle toy is best for aggressive chewers?

Soft plush puzzles like hide-and-seek squirrel toys are not appropriate for hard chewers and reviewers consistently warn they can be destroyed quickly. For strong chewers, owners in the communities we read lean toward rigid rubber toys (like the WOOF Pupsicle) that can be filled, frozen, and supervised — and many recommend taking the toy away once the food is gone to extend its life.