4D Sudoku
27 cubes. Arrange them in a square block so that each possible 3x3 section contains the numbers 1 to 9, with no repetitions. All the numbers in each 3x3 section, row or column must be oriented the same way. From 4dsudoku.net.
The Best Free Puzzles, Riddles and Mystery Games On The Web
EXPERT LEVEL GAMES
Sleepy Head: An Online Cartoon Puzzle
Looks very funny at first sight: just 16 comic strip pictures to be arranged in the correct order. A very hard puzzle in reality where every subtle clue matters. Don't even bet how long it will take you to produce the final cartoon. From SmartKit.
Puzzle Box
Get the yellow polygon down in the cube, so it would open itself. If you watch closely to the loading display you will get a quick flash of the solution. The parts available to move/rotate are always highlighted with arrows while rolling over. From Merj.com.
Qink
Use WASD or arrow keys to turn the cube. Select an area of the cube by dragging your mouse, then pick a shape to fill it. All shapes must be used in such a way that any cube's face is colored in one color only. From MyGame.com.
Untouchable 11
Put 11 hexaminoes within a board so that no two pieces touch each other even at a corner. Three different challenges: easy, medium, and hard. By Peter Grabarchuk. Presented as a visual-spatial puzzle contest at Smart-Kit
.
Play
Z-Rox
A letter, a number, a symbol, a shape or an object invisibly floats upwards. What you can see is a spot where it passes through horizontal line. Feels like "seeing through a line." Guess what the object is. Once you know it - type your answer. The answers are in English and can be words. By Evil-Dog. Presented at Smart-Kit.