I­­ was­­­­­ browsing­­­­ through­ stackoverflow­­­­ meta­­­­, and I found a new way to hide text. Have fun! Hint: After you find the ink, there's another tiny layer. Answer should be obvious.

My first is a musical choir My second is solid, a large one My third consists only of zeroes My fourth has just quickly run

Add "g", and I may end early in the morning. Add "b", and I may end late in the afternoon. Add "t", and you better listen while you do it. Add "y", and it can come in a bundle. Answers should be in the form _ndroid followed by your explanation.

This quiz is about the 8-puzzle. It is a board with 9 fields. There are 8 plates with numbers from one to eight. One field is empty. You can slide numbers around the board: But only numbers next to the empty field can be slided into the empty field: 1 2 3 4 5 6 7 8 You can slide the 2,...

It's rather easy to fill a $7 \times 7$ board with 16 long triominos, leaving the center square void: see the picture below. But if I want to move the void square in another position, where else could I place it?

So almost 8 months ago I wrote a decently popular riddle. It enjoyed some pretty decent activity, garnered enough upvotes to be instrumental in me getting out of Low-Rep Hell. However, it is still unanswered. Despite the fact I am still reasonably proud of it, I have horribly botched its executi...

This not-so-simple puzzle asked by my teacher today, given: $2+2=3$ $4+8=27$ $3+4=8$ So, the answer for: $5+32=?$ I'm new here so pardon my mistakes. Please let me know what you guys thinks about this riddle.