"Whose hand is it on top" is an unusual (apparently Turkish) variant of hand-stacking games. A physical(ish) game for at least four players.
A player is chosen as the guesser, who then crouches down in all fours with eyes closed.
Other players put their hands one on the top of each other on the guesser's back, creating a tower of hands. Now the guesser is asked aloud “Whose hand is it on top?” and it tries to guess
the player whose hand on the top of the stack is.
Correct guess means the the player whose hand on the top was becomes the new guesser and crouches down.
In the more likely case of an incorrect guess begins the more fun part. Hand-stacking players ask aloud "Drum, oboe, needle or yarn?", asking the guesser to pick a penalty for the
incorrect guess. Drum means all slamming on guesser’s back, oboe means making irritating high-pitch noises at its ears, needle meaning pricking the back with fingers, and yarn meaning pinches on
the back.
The guesser retains the same role until it makes a correct guess.