Right now they are not combining parties. You cannot buy tickets online for 2, only minimum of 4. But you can go into their location and do it with less than 4. But my group of 4 only barely beat it with 3 minutes left, using 3 clues. It would be quite rough with only 2, especially 1 or 2 of the puzzles.
Yes. They put you with other people to make a group. 8 people I think. I went with a group of 3. They paired us with another group.
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