I have the standard 3x3 Ghost Cube, and I would like to get more sizes. On this page on ruwix.com there is an image for 2x2 through 7x7 Ghost Cubes, but I can't figure out where I can buy them. Does anyone know how I can get at least the 4x4 Ghost Cube?

Take the 4 aces, 4 twos, 4 threes, and 4 fours from an ordinary deck of playing cards. Is it possible to place them in a row on a table so that there is precisely 1 card between any 2 successive aces, 2 cards between any 2 successive twos, 3 cards between any 2 successive threes, and 4 cards be...

The angry astrologist has locked you up in a series of a room. With your superior thinking abilities, you escape them one by one, until you reach the final room. There’s a locked door with an electronic keypad with the numbers 0 to 9, and it only takes 4 digits. In the middle of the room, there’...

This puzzle is based on the framework described here: Controlling a robot blindfolded on a 9x9 grid Here is a quick summary. A robot is located somewhere on a grid, but you cannot see it. You can send commands to the robot to make it move one cell left, right, up or down. If a robot hits a wall ...

I came across this site and you all seem really smart so I was possibly hoping you could help me. I have this puzzle and I can't work it out, does anyone has a clue or answer? When the Romans counted the entirety of their whole army, their sum was greater than the value of this.

Inspired by a previous question here Up is a surprise, Down is to deny. Under folds down, Over, a small pie, In begins at night, Out is who attends, On tends to excite, Off comes with a bend.

An ant is a methodical creature, and the ants in this puzzle are particularly so. When they start walking they always walk in a straight line, and when they reach a boundary they always turn exactly $90^\circ$ anticlockwise. If they still cannot move, they turn through $180^\circ$ and try to mo...

An extremist religious organization called "The Redeemed Against Scientific Usurpation of God's Authority", or RASUGA, have converted the world's leading time travel researcher to their beliefs. Using his credentials, he assisted RASUGA in stealing his time machine from his lab at the CERN facili...

If you are alert, you might clearly see an object in your imagination when you read the sentence: "It lasted only from CTScan to Face Palm." What is the object?

Thief! Thief! He took my rock!                                                               (Click individual images to enlarge) Answer is a thematic word.