Turn the tiles
Every tile turns, and only one position of each joins the pipes into one network.
Click a tile to turn it clockwise. The puzzle is solved when every lamp is lit: the pipes form one network from the pump, with no pipe pointing at nothing and no closed loop. These first boards are tiny, so you can see the whole idea at once.
How it works
A tiny puzzle: the pump in the middle, lamps around it, every tile turned at random.
Your turn
Four positions, each needing this lesson’s technique. The pinned tiles are given; turn the free ones until every lamp is lit. Click a tile to turn it, Ctrl+click to turn it back; right click or long press pins it.
Turn the free tiles so that every lamp lights up.
Why it works
Every puzzle on the site has exactly one solution, so every tile has exactly one right position. The next lessons show how to find it by reasoning instead of trying turns at random.