I think Escape the Museum is one of the best solving puzzles/hidden objects games. You can take as long as you want to find the objects, but beware of clicking on the wrong items. Your score goes down very quickly.

I am about 1/2 way through the game and I love it. It has the hide and seek features, some are quite hard but you must also collect clues and escape from each room. You get rated on time and percentage of correct finds. Your score drops significantly when you click on the wrong object or use hints the first time and a little less every time after. So time is not as much of an issue as in most games of this type. Story is a wee bit corny but aren't they all. It is probably one of the bet HIDE/SEEK games I have played due to having to escape each room. Highly recommended. If you like this type of game, I recommended

http://www.azureusgame.com/Puzzles/Escape-the-Museum.html. Hope to see you there!

Escape the Museum is an utterly fascinating adventure/hidden object game for Windows/Mac that reaches into room escape territory for inspiration. It could have been a really good game. It combines both types of my favorite games. Puzzle/logic and hide and seek. Parts of the puzzle where you need to find objects to use together to escape a room are almost so easy a first grade child could do them. All you have to do is move your mouse around and little messages will pop up telling you what to do.

Like similar themed adventure games such as Azada and Dream Chronicles, you can click on certain objects to add them to your inventory, and then select that item to use on a different location in the scene (such as using a key on a locked door). When the mouse scrolls over a point of interest that can be examined more closely, like a display case or drawer, it will change shape and allow you to click and zoom in for a closer look.

I just finished playing the demo for this game over at http://www.azureusgame.com/Puzzles/Escape-the-Museum.html. It looks to be more interesting than expected.