Sliding number puzzle
Number Slide
A free sliding-number puzzle with three-by-three and four-by-four boards. Move tiles into the gap until the numbers read in order. Every board is scrambled by legal moves, so every board can be solved.
FREE LIGHTS-OUT LOGIC PUZZLE
Light Grid
A free switch puzzle with five solvable circuits. Every press flips a window and its neighbors. Leave the whole grid dark in as few turns as you can.
Play Light Grid ↗Free in your browser · No download · No account
How to play Light Grid
Tap a window to flip it and its four neighbors. Turn every light off. Arrow keys move the cursor; Space or Enter flips. Hint highlights a useful switch and costs three turns. Reset restores this circuit and costs three turns.
A good first strategy
Try working across the board in a consistent order. Notice which lamps each switch changes and use that relationship instead of tapping at random.
The challenge and the score
Solve all five circuits. The shared leaderboard ranks the five highest point totals. An ended attempt can earn points even when you have not completed the whole challenge.
You can leave a public name of one to six characters if your score qualifies. You do not need an account to play or to leave a score.
Another little challenge
Minesweeper puzzle
Mine Lantern
A free seven-by-seven mine puzzle. Read the numbered clues, mark eight hidden hazards and reveal the safe floor. Your first opening and its neighbors are always safe.
Sequence memory game
Echo Keys
A free visual memory game with four big pads. Watch the growing phrase and repeat it with touch or A, S, D and F. Clear twelve rounds before your third mistake.