Three Boxes Problem

For the solution, click "read more" below:

Alice's Party

For the solution, click here.

Strange Symbols

Solution to puzzle 1:

Solution to puzzle 2:

For the full solution, click here.

Museum Guard Problem

For the solution, click here.

For more museum guard problems (and solutions), click here. 

Decorated Cube Problem

For the solution, click "read more" below.