Here are a couple of my favourite mystery hidden object games for computer which you can also play online for free:
Clue – Play Cluedo Online
You can play Cluedo online with a hidden object game adaptation of the Clue board game this version has a new Hollywood mansion to explore for clues – but with the same basic Clue theme.
For more details visit: Mystery Hidden Object Games Online – Cluedo
Free Detective Games Online
You can play a free play HOG based on Agatha Christie’s Death on the Nile and help Poirot search the ship for clues as you sail down the Nile! For a review and other details visit: Free Online Detective Games – Agatha Christie’s Death on the Nile