Batman Joker Card - Point And Click Escape
The room is filled up with various items where the idea is to collect them and use them in order to solve this mystery. Basically this is a classic point and click escape game featuring The Dark Knight. Let's see how to solve this puzzle.
First, take the red book and scroll down through the pages until you see the Joker's card. Get it and put it on the inventory. than click on a gun, sitting right next to the red book. It should magically disappear. If you click on the arrow, you will get to the other side of the room. Now, there's a basket. Just click on it to take a look inside. There's a spoon inside the basket. Click it to take it out (also magically disappears) and than search through the paper scraps and see if you can find a part of the batman's sign. Obviously his badge has been ripped off into pieces and you need to put it together, as a part of the puzzle.

Well, than you should pick up or click as much things as you can in that room, just like in any other point and click game. I won't be going any further with all the details as you can see the video walkthrough in case you got stuck, but this what's been said so far should give you a good start.
In the end, you should be able to cut off the red wire with the scissors, in order to stop the bomb ticking. Also this is how you get the key which opens the blue door and let you out. And this is the end of the game. Batman is saved and free and now he can recover and work on his revenge against The Joker.