Each level starts out with a case to solve, and some possible clues.

One place investors have looked for possible clues to the market's future course is the 1929 stock market.

He looked at the paper for some possible hidden clue.

"So we have three possible clues," he said by way of starting things off.

He wanted me to watch for any possible clues to their being here.

But where should she start hunting for possible clues to a second will?

Several senior government officials said they had recently picked up a possible clue.

Here at last, in my very room, was a possible clue.

They probably followed several possible clues at the same time.

There, he was checking the ground for every possible clue.