Solvable

Light puzzles with a proof attached

All targets lit

Solved

Level 1 of 10

First bounce

Tap an empty cell to place a mirror. Tap it again to turn it, a third time to pick it up. Light every ring.

Hand-made levels

Machine-made

Content sandbox

Levels are plain JSON, written by a designer or by a language model. Edit the JSON and the validator re-checks it on every keystroke: shape, geometry, then an exhaustive solver that proves the level has exactly one answer and that the learner has to do something to reach it. Every error names what to change, and fixes marked verified were applied and re-solved before they were offered.

Start from Seed

Preview

Sample levels. An experiment in validated, machine-checkable puzzle content by Levelbrook.