a2Lights Up
A game on zen2play
Light every square. Let no T3neo shine on another.
a2Lights Up is a light-placing logic puzzle played worldwide, with our T3neo as the light. Each T3neo lights its row and its column straight up to the stone walls. Light the whole board — and keep every number on the walls exact.
- 6×6 and 9×9
- Medium and Complex
- Exactly one answer, no guessing
- 15, 30 or 45 minutes
A solved 6×6 from the game: every open square lit.
Three rules
The board has open squares and stone walls; some walls carry a number. Place T3neos on open squares so that:
Every open square is lit
A T3neo lights its own square and every open square straight up, down, left and right, until a wall or the edge stops the light. Light never turns a corner.
No T3neo shines on another
Two T3neos may never see each other along a row or column with no wall between them. Their beams may cross on an empty square — that is fine.
A number counts its neighbours
A wall marked 0 to 4 has exactly that many T3neos on the four squares beside it. Diagonals do not count, and a wall without a number only stops light.
Playing
Tap a square to place a T3neo, tap it again to turn it into a × (a square that cannot hold one), and tap once more to clear it. Clear empties the board. Show mistakes points out two T3neos that see each other and a wall with too many.
Every puzzle can be solved by thinking
Each puzzle has exactly one answer, and every step to it can be reasoned out — you never have to guess. Stuck? Show hints names the next idea and shows where it applies.
Thinking it through, with pictures
Each example is a real puzzle from the game, before and after one idea. Every example was checked by the a2Lights Up engine.
Step by step, until every square is lit
A 6×6 from the game, solved one idea at a time.
Two sizes, two levels
6×6 · easier to Medium
2,000 puzzles: 1,600 Medium and 400 Complex. A good place to learn every idea above.
9×9 · Medium to Complex
2,000 puzzles that make you think: every Medium needs the deeper ideas, and every Complex needs a look ahead.
Your time
Pick 15, 30 or 45 minutes. The clock starts with your first move.
Two views
Play from the Top or in Perspective, and turn the board to see the stone walls from every side.
Show solution
Stuck? The answer is there — but a shown puzzle does not count as solved.