puzzler

"Well, if this isn't a puzzler, I don't know what is," observed Grif.

Rice plunged his hands deeper into both pockets and shook himself like a mastiff, satisfied that the boy had got a puzzler now.

The picture seems a puzzler to all who watch it, and as the crowd is great the confusion of wits is catching.

We are at a loss as to how he came into the empty house; indeed, the whole affair is a puzzler.

The next scene was a puzzler, for in came another animal, on all-fours this time, with a new sort of tail and long ears.