Signal Lost

Signal Lost is for teams who have done a few rooms and want one that pushes back. It is set in 1962 in a radio listening post dug into a hillside, and it is mostly sound: real valve radios that tune to real frequencies Ioan recorded, a Morse key, a bank of switches that has to be thrown in the right order, and a red telephone that rings when you least want it to. The puzzles chain together, so a mistake early on costs you later.

The room changes partway through, which is all we will say. It needs at least three people because the last sequence needs three pairs of hands at once, and it suits five. If anyone in your team cannot hear well, tell us when you book; we have a version of every sound puzzle that works by sight, and the game master will switch it on.

About 22 per cent of teams escape and the record is 46 minutes 3 seconds by a team of four in February. Most teams who do not escape book again; the second attempt is 20 per cent off and about half of second attempts get out.

What is included

• Sixty minutes in a 1962 radio bunker with working valve radios
• A sound-free version of every audio puzzle on request
• A game master on the cameras and the radio throughout
• Three free clues on the walkie-talkie
• A team photograph with your time, emailed that evening
• A second attempt at 20 per cent off

What it costs

From £78 for three to £114 for six, any day, with 10 per cent off before 4pm Monday to Thursday. Sixty minutes; three players minimum; we suggest you have played one room before. The booking page works out the total and the price a head for your group; the rooms page shows every free slot today and tomorrow.