What is the minimum number of 1/4 turns of a solved 2x2 Rubik’s cube, such that no face will have two tiles of the same color? (I do not have this puzzle’s solution.)

Could we devide a square in to 4 pieces so that each piece has boundary with the others? Pieces need not to be the same as others

Imagine we have a $7 \times 7$ square we want to color it the way each row and column exactly has 3 colored square

There is a desert which can be crossed only by walking and this takes six days. The explorers of the desert can carry at most four days' water and food. If they want, they can take helpers with them. What is the minimum number of helpers that an explorer need to cross the desert? ["If the explor...

These are pentominoes, with letter codes: Create 4 yes/no questions which uniquely classify each pentomino. Examples of such questions are: Does it have rotational symmetry? Does it have reflection symmetry? Is it the net of an open box? Does it have point symmetry? The idea is to create a se...

I come with time To most, if not all people Don't forget, you might get me too I am a very emotional pendulum And can cause people to go mad Remember, I'm not uncommon Tens of millions is my count I take what is precious from you Yet you won't know when I do What am I?

I can Go with your heart but not with your brain Mess with your head but not with your hair Flow with your blood and hang with your shoulder Stay with your feet but not with your ankle Who am I?

You'll need to know about: A game that has existed for over 1500 years A game that doesn't exist Answer = Xxxxxxxxx