Move all three lights so every thick colored line around the border glows exactly the color it needs, its whole length
Rules
Each light shines in every direction until a black wall line blocks it
White lines are mirrors — light bounces off them instead of stopping (Hard puzzles only)
A goal line only counts as lit once it's completely covered by its color, end to end — a shadow crossing any part of it means it doesn't count
A Red, Yellow, or Blue goal line needs light from only its own color reaching it — any other color landing there too spoils it
An Orange goal line needs both Red and Yellow (and no Blue); Green needs Yellow and Blue (no Red); Purple needs Red and Blue (no Yellow)
Every puzzle has exactly one placement that satisfies all six goal lines
Controls
All three lights start parked in the bank below the board — drag one up onto a grid-line intersection to place it (you can't place a light on a wall or mirror's own endpoint)
Drag a placed light to a different intersection to move it, or back down into the bank to park it again