Well I just have level one and three keys. Where is key 2?
If you have key 3, you don't need key 2--you can enter the dungeons up to the highest key you have found. Some peeps put the keys into inventory it seems, but you don't need to and I don't see any advantage to doing so (who needs more junk in that inventory screen! hehe...).
If you check your secondary action buttons, it will show you the highest level key you have found in each act... <img src="/ubbthreads/images/graemlins/idea.gif" alt="" />
