How to buy tickets for Stockholm metro?
- No, there are multiple zones, mostly you have to cross from one zone to another, hence pay more. Here's the metro zone map:
They sell 16-ticket slips for 200 SEK, you need two units (tickets) if you're traveling within a single zone, three units when in two zones (e.g. from A to B) and four if you're traveling between three zones.
The easiest way would be getting the tickets at stations, there are vending machines and also sometimes cashiers selling those tickets.
In fact the enitre subway system is in zone 1. The subways are the red, green and blue lines on the map, with numbers starting with T (from Tunnelbana). The grey and black lines are suburban railway lines. And in part two of your answer I would suggest using the word "units" instead of "tickets" as the latter suggests you need to have three pieces of paper.
I think it's clearer to think of it as if you're buying 16 separate tickets, but spend a few tickets for each ride. Still, I made the change you suggested and put the word _ticket_ into parenthesis, maybe it's clearer this way.
On the page that @notautogenerated posted, under Visitor Tickets -> Travelcards it says that a 72-hour travel card costs 230 sek, and a travel card can be used only by one person at a time.
Note that the automated vending machines for single tickets accept credit cards but **no cash** (at least at the station where I tried). Be careful if you plan to travel at a time when human-operated shops are closed.
One confusion to watch out for: the machines offer an option described as “RED”. This is not anything to do with the red subway line, as I have known some visitors to assume — it is short for “reducerad”, i.e. reduced fare for the elderly and similar.