Alice and Bob are playing a game on an initially empty 3x3 matrix. They take turns, and each turn: They add a number in {1,2,3} to an empty cell. They are not allowed to repeat a number in a row or a column (like a partial Latin square). The last person to move wins. Alice goes first. A game ...

There are lots of questions in the Puzzling Meta about coded comments, suggesting that there's a demand for spoiler blocks within comments. The spoiler block is already a StackExchange addition to Markdown. Is it possible to get a similar addition to allow inline spoilers/spoilers in comments? On...

A robot is placed on some vertex of a 3x3 grid. At each move the robot can take one step (up, down, left or right) along the edge of the grid to the adjacent vertex, but it cannot go outside the grid. The robot can revisit vertices, but it cannot revisit edges. What is the most number of edges th...

Suppose a man only tells the truth three hours a day. It is the same every week and it is known that the pattern of the truth hours are TFTFT. (which means he may tell the truth at midnight and 2am and 4am, 7am and 11am and 1pm, and so on). On the other 21 hours, he lies. All times between 7pm an...

I can burn, I can attack, I can ache, I can break, Add my head, you might find me in a shack, Move my head, you can go on a long trek. I can stop, I can eclipse, I can throb, or be warming, Remove my tail, then use those ears, Remove my legs, its so scorching! What am I?

My prefix is old advice My infix will guide you away My suffix is my own My whole was not right the first time What am I?