Premium

Ten lands in the works, for Premium

Each one ends with a problem nobody knows the best answer to. They open one by one.

• CodeIn the worksMirror Maze

  Bend the Beam

  A lighthouse beam is trapped in a hall of mirrors. Follow it through a thousand bounces, then place the mirrors yourself and light every crystal in the hall.

  You practise: Simulation on a grid, reflections, loops that never end, search

• CodeIn the worksRelay Hills

  The Broken Telegraph

  Messages cross the hills as dots and dashes, and the storm flips some on the way. Repair them, then invent a code of your own and send it through the storm.

  You practise: Bits, parity, codes that repair themselves, designing a code

• CodeIn the worksPaper Workshop

  Fold and Punch

  Fold a sheet, punch one hole, unfold a snowflake. The workshop lost the instructions and kept the patterns: find the folds that made each one.

  You practise: Coordinates, symmetry, recursion, working backwards

• CodeIn the worksWater Works

  Pipes Under Pressure

  A whole city drinks from one reservoir through a tangle of pipes. Find the one pipe that holds everyone back, then decide where the new ones go.

  You practise: Networks, maximum flow, the narrowest cut, planning upgrades

• CodeIn the worksTide Harbour

  The Last Crane

  One crane still works, the quay is stacked high, and every ship wants its containers in order. Write the plan with the fewest moves in the whole harbour.

  You practise: Stacks, simulation, sorting with limits, plans with the fewest moves

• AI / ML / DataIn the worksEcho Canyon

  Name That Tune

  The canyon repeats every sound it hears, a little worse each time. Pull the notes out of the echo, then squeeze a whole melody into a handful of numbers.

  You practise: Signals, frequencies, filtering out noise, compression

• AI / ML / DataIn the worksLighthouse Coast

  Where Am I?

  Fog on the coast. Every boat knows roughly how far each lighthouse is, and one lighthouse lies. Put the boats back on the map, then build new lighthouses where they matter.

  You practise: Least squares, locating from distances, measurements that lie, where to measure

• AI / ML / DataIn the worksNeuron Creek

  The Tiny Brain

  A small robot must tell ripe berries from poisonous ones. You wire its brain yourself, weight by weight, and watch it learn. Then you build the smallest brain that still gets it right.

  You practise: One neuron, hidden layers, training by small steps, small models against accurate ones

• AI / ML / DataIn the worksFrozen Lake

  Teach the Fox

  A young fox crosses the ice to reach the fish. You cannot steer it: you can only leave an arrow on every tile. Then the ice starts to slip.

  You practise: Policies, expected reward, planning when things go wrong, learning by reward

• AI / ML / DataIn the worksBridge of Tongues

  Rosetta

  Two towns share a bridge and no language. All that is left is a pile of signs written in both. Teach your program a language nobody has ever seen.

  You practise: Counting which words appear together, matching words, translation, measuring a translation