Optical bench · route the light
Every crystal lit
Room complete
The observatory is lit
New instrument
Twelve rooms
Room
Sound and navigation
The instruments
A lamp fires a beam of white light across the bench. Place instruments so the light reaches every crystal. Pick a tool, tap an empty square to set it down, tap it again to turn it. Tap lift then a piece to take it back.
Keyboard: arrows move the cursor, number keys pick a tool, Enter places or turns, Backspace lifts.