By the end of a mission in Corvallis, you will know exactly who on your team can keep a secret. Plan your next surprise party accordingly. In plain terms: a 2.5-hour team spy game on foot, played on your phones. You will see Corvallis. You will also see a side of your teammates that no dinner party ever revealed. Some missions need a sharp eye, some need a little nerve, and some need everyone talking at once. No puzzle skills required, just a sense of humour. There may or may not be a double agent on your team. By day or after dark, this route works: about 2.5 hours, 4 stops and 1.3 km on foot, with evening games possible. Afterwards, the surprise-party planning committee has a shortlist, and one teammate is never being told anything again. Who it's for: friends, couples and families with teens; and private groups, from bachelor and hen nights to work teams and active over-55s. Book a private game for 1 to 8 players on a date you choose; a team of one works too. Bigger groups play as several private teams.