There are many different Quests you can do around the site. There is no limit to the number of Quests you can do. Quests are timed so you can fail if you do not complete the Quest on time. If you are asked for an item you cannot get for any reason, just wait for the Quest to run out of time and start a new one. You can see how many of each Quest you have done by viewing your Profile. Click the image of the Quest for more information.