Frequently these puzzles require players to co-operate in reaching various goals.

Most of my stories have puzzles in them, and puzzles require rules.

The puzzles are generally intuitive and don't require any bizarre solutions.

The puzzles required careful use of the tools provided, and as a result, I felt that the game was on rails.

One unique puzzle requires Alabama to shed some light in a dark level before it can be completed.

Later puzzles may require the use of multiple dolls to combine their skills.

Some more difficult puzzles may also require several types of "what if?"

Some more difficult puzzles may also require advanced reasoning.

Some puzzles may require to go deeper with searching for the contradictions.

Some puzzles require the talents of a specific killer7 member.