Looking for a mental challenge? Puzzle games are perfect for keeping your brain sharp while having fun. Here are the best free puzzle games you can play online today.

1. Tetris – The legendary block-stacking game that never gets old. Stack blocks and clear lines to score points.

2. Mahjong – A classic tile-matching game with hundreds of levels to keep you entertained for hours.

3. Sudoku – Train your logic with this popular number placement puzzle. Great for beginners and experts alike.

4. Word Search – Find hidden words in a grid of letters. A relaxing game for all ages.

5. Jigsaw Puzzles – Solve beautiful jigsaw puzzles online with varying difficulty levels.

These puzzle games are completely free and work directly in your browser with no downloads required.