We visited on a sat afternoon. Did not pre purchase tickets and only purchased the ticket on the spot. The entrance is at lvl1 and you can take a lift to lvl 3 where the ticket counter is. We purchased 2 adults tickets and it's free entry for our kids (both 5 years and below). Once you purchase the tickets, its recommended to go to the toilet first as there are no toilets at the top where the observatory is. Passing thru the ticket counter, you will come to the lift lobby to take the lifts to the top of the observation deck. The lift has transparent glass walls on all 4 sides so it allows you to view through as the lift goes all the way up (takes around 60s). You will get to observe the internal structure of the tower as well as look through down to where the city and other sights are. Once at the top, you will come to a small observation deck with glass windows to allow you to observe the scenery beyond. All around, you will see tables set up to display the souvenirs for purchase. One has to mind your head as you walk about the small observation deck as the metal structures and beams are all around. We were there around 12pm, so taking pictures was a challenge as it was too bright and sunny outside. Maybe it would be nicer probably around sunset time? We did not spent more than 30mins up at the observation deck as there was nothing much to see actually.