15 Puzzle
The original 4x4 sliding number puzzle. Slide tiles 1 through 15 into order around the empty space. Every shuffle is guaranteed solvable.
8 Puzzle
A compact 3x3 sliding number puzzle - the smaller, faster sibling of the classic 15 Puzzle. Slide tiles 1 through 8 into order with a guaranteed-solvable shuffle.
Higher or Lower
Classic number guessing game. The computer picks a secret number between 1 and 100 - guess it in as few tries as possible using higher/lower hints.
Lights Out
The classic Lights Out logic puzzle. Clicking a light toggles it and its neighbors - turn every light off in as few moves as possible. Always solvable.
Missing Number Game
A shuffled set of consecutive numbers is shown with one or more missing. Spot the gap and enter the missing number(s) to score points and build your streak.
Number Sequence Game
Spot the pattern and fill in the missing number in arithmetic, geometric, square, cube, Fibonacci, and alternating-step sequences. Score and streak tracked.
Odd or Even
A fast-paced reaction game: a number appears, and you must click Odd or Even before time runs out. The time limit shrinks as your streak grows.
Sliding Puzzle
Classic sliding number puzzle with selectable 3x3, 4x4, or 5x5 grids. Every shuffle is verified solvable. Slide tiles into order and track your move count.
Sudoku
Play real, computer-generated Sudoku puzzles online. Choose easy, medium, or hard, get live conflict highlighting, and check your solution instantly. Free, no sign-up.
Sudoku Mini
A faster, smaller 6x6 Sudoku variant with 2x3 boxes. Great for quick games or Sudoku beginners. Real generated puzzles with live conflict checking.