In the following escape rooms in Estes Park, you must purchase the entire experience at once. You'll only play with the members of your own team and won't be paired with strangers.
The only requirement is to meet the minimum number of players for the room — the price is usually set for the room itself, though it can also depend on the number of players.

Ancient engravings unlike you’ve ever seen. Crumbling walls and terror found only in dreams. You can be the hero if you can brave these hallowed halls. Bring your best thinking tools or watch yourself fall.
These gates don’t open by force of hand. Underwater mysteries is where you may land. Through countless riddle, puzzle, and toil. Insurmountable treasure in water that will never boil.