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YoHU.io
PuzzleSingle playerLive

Play Lights — Wire Connecting and Light Bulb Puzzle

Rotate the wires, carry the power from the battery and switch on every light before time runs out.

YoHU Lights is a connection puzzle where you rotate wires to carry electricity from the battery to the light bulbs. The pieces on the board come scrambled; each tap rotates a piece a quarter turn clockwise. The level ends when the circuit from the battery reaches every bulb.

There are four difficulties, from Easy 3×3 to Expert 10×10, with 10 levels each — 40 puzzles in all. Time is limited, and the faster you finish the more points you earn. No download or sign-up needed; it opens in your browser on phone or computer.

Play now

Single player · opens in your browser

How to play

  1. 1Click 'Play now', press PLAY and choose a difficulty.
  2. 2Pick an unlocked level; at first only level 1 is open on each difficulty.
  3. 3Tap a piece to rotate it clockwise. Wires connected to the battery light up, and bulbs the current reaches shine.
  4. 4When all the bulbs are lit the level is complete; continue your streak with Next level.

Rules

  • Difficulties: Easy 3×3 (90 s), Medium 5×5 (90 s), Hard 7×7 (120 s), Expert 10×10 (240 s).
  • Level score = seconds left × 10 × difficulty bonus (Easy ×1, Medium ×2, Hard ×3, Expert ×5).
  • The scores of the levels you clear with Next level add up in your total; if time runs out the game ends and the total resets.
  • Clearing a level unlocks the next. Your progress and best score are stored in this browser.

Strategy tips

In the solution no wire points off the board, so the direction of edge and corner pieces becomes clear quickly.
Bulbs have a single connection; look at the neighboring pieces to narrow down which way the wire can come from.
Cross pieces open in all four directions don't need rotating; spend your taps on other pieces.
On big boards, build the circuit step by step outward from the battery; wires the current reaches light up, so you can see where it breaks.

Frequently asked questions

Is Lights free?

Yes, completely free; no download or sign-up needed.

How many levels are there?

10 levels on each of four difficulties, 40 puzzles in total. Each level unlocks when you clear the previous one.

Is my score saved?

Your best score and unlocked levels are stored in this browser; they're not linked to a YoHU account or the leaderboard.

Does it work on mobile?

Yes. The game is designed for portrait screens; you play by tapping the pieces with your finger.