How to think like Sherlock Holmes

Description:
Do you have the brains to be a super sleuth? Test your mental prowess, and sharpen your observation and memory skills.
Identify symbols or letters within the card illustrations that match across a group of 4 cards within the grid. Clear the grid within the time limit to move onto the next. The quicker you are, the more points you score.

Instructions:
Use mouse to select/deselect cards and use a hint.