To this date, Slider Puzzle has been downloaded 1150 times, which is a bit more than I expected! Today I've released the updated version 1.03. The update features the following changes:

You can now choose easy, medium or hard on random and photo levels, there are eight new predefined levels, tiles no longer jump to their place when you release them, but ease to it and the device will vibrate when you're trying to move a lock.

So once again, let me know what you think of the updates and what updates you'd like to see!

UPDATE 2/11: It's one day later and slider puzzle now has been downloaded 1800 times. That's 650 times in one day! :) Also I've updated it to 1.04, which shows a white flash on tiles you slide to the right spot.