Knock

Nobody's coming. And nobody's looking for you either.

You wake on the ice in a storm, with a map, a compass and a pair of red mittens. Shore is north. Everything else is water.

Listen to it

You can't see how thick the ice is. You can hear it. Kneel and knock: a low, solid knock means it will hold, and a high, hollow ring means it won't for long. Stomp ahead to find where one slab ends and the next begins. Throw a stone and listen to how it lands.

Every test weakens what it tests

Each knock, stomp and stone tells you something and costs the ice something. When a slab goes, the ones around it get weaker, and you won't be shown which.

The cold kills anyone who tests too much

There is no health bar and no timer. Your breath gets shorter, the edges of your sight close in, and your heartbeat slows. Fires on the map buy you time, if you can reach them. Go in the water and you will almost certainly not come out.

What you get

• A first-person crossing with no monster. The ice and the cold are the whole threat.
• Ice that answers back: knock, stomp, crawl, throw, sweep snow away, and read what you hear.
• A new sheet every run, or enter a seed to try the same sheet again.
• Three difficulties and an optional tutorial.
• One crossing takes about 10 minutes. Most attempts end sooner.

Best with headphones.