What's the time, Mr Wolf?

What's the time, Mr. Wolf? (also known as What time is it, Mr. Wolf?, 1 2 3 Piano in Belgium and in the United States What time is it, Mr. Fox?) is a form of tag played in Australia, Belgium, Canada, the United States, the English-speaking Caribbean, Hong Kong, Ireland, New Zealand, South Africa, and the United Kingdom.
Because it needs attention skills, quick reactions, and working memory for the "it" child, it is recommended by Harvard University's Center on the Developing Child to assist in developing executive function skills for children aged 5 to 7.
One player is chosen to be Mr. Wolf. Mr. Wolf stands at the opposite end of the playing field from the other players who stand in a semi-circle around them. On some occasions, if the chosen player is female she is referred to as "Mrs. Wolf". A call-and-response then takes place: all players except for Mr. Wolf chant in unison "What's the time, Mr. Wolf?", and Mr. Wolf will answer in one of the two ways:
The two goals of the game for the players and for Mr. Wolf are the following:
An additional element of play in some versions of the game, such as that often played in the United Kingdom, sees the game set up with Mr. Wolf standing against a wall or similar such structure, and whilst his back is turned from the players, they also have the option of trying to sneak in either extended length steps or to add additional steps undetected by the wolf, with the aim of reaching the "safety" of the wall to either side of the wolf ahead of the other players. If they successfully reach the wall by this method, then the player will call out "Safe" or "Home" (or similar variant), thus becoming exempt from being caught by the wolf.
In many versions which include this element, if the wolf hears these extra steps being taken by a player whilst his back is turned, then he will call out "Heard you!" and spin around to point at the suspected player. If the wolf's accusation is correct, then depending on the version being played, the offending player will either have to return to the position they first started the game in (leaving them to likely be the last to reach "Home" and thus most likely to be caught by the wolf), or to themselves simply become the wolf by default. In addition, if the offending player is within the wolf's reach when he turns around to accuse them, the wolf may simply attempt to grab them - if successful, the captured player will again then become the wolf.
An occasional further condition to the above version, is that sometimes that player(s) who safely make it "home" ahead of time without being spotted by the wolf, must stand facing the wall, so as not to offer any support nor distraction to either the wolf of the remaining players.
In some parts of North America, the game is called "What's the Time, Mr. Shark?" when played at a pool or beach.
In Hong Kong, the game is often played in Cantonese, the lingua franca of the city. The opening call is 狐狸先生幾多點 (Jyutping: wu lei sin saang gei do dim; lit. "what time is it, Mr. Fox"), and "twelve o'clock" (十二點; sap ji dim) is typically used instead of the name of a mealtime.
It is not uncommon for "Mr. Wolf" to be allowed to look around at the other players, before answering the question; especially if there is a rule involving penalties applied to "Mr. Wolf" if a player reaches "Mr. Wolf" before "Dinner time" is called.
There is also a simpler version of the game where "Mr. Wolf" faces the other players, who must remain stationary until "dinner time" is called. If any player moves on a time of day being called, that player becomes "Mr. Wolf".
In another version, Mr. Wolf holds a dandelion seed head and blows on it. The other players dance around them, taunting them by calling out "What's the time, Mr. Wolf?" After each blow, Mr. Wolf calls times in ascending order (e.g. "1 o'clock", "two o'clock", etc) until all the seed head has been blown away. "Mr. Wolf" then calls out "Dinner time!" and chases the other players, aiming to tag them before they can claim sanctuary at predesignated points called "Bar". The players claim "Bar" by yelling out "B - A - R Bar" and touching the safety point. The skill is in deciding when the seed head is going to be completely blown away, as the players cannot run away until this happens. It could happen after one blow by "Mr. Wolf", or several. The first player tagged becomes Mr. Wolf for the next round of the game.
This game can also be played on a hopscotch court. The players chant "What's the time Mr. Wolf" and the wolf replies with a time. The players hop that number of spaces forwards on the hopscotch court. If "Mr. Wolf" answers with "It's dinner time" the players try to run back to the beginning of the hopscotch court before they are caught by "Mr. Wolf".
Similar games include Lupo Delle Ore in Italy, and Captain Midnight in the United States, in which everyone has to start running at midnight. The game also bears some resemblance to Red light, green light and Dahrumasan ga koronda.
Another variant of this game which has become popular is "Mr. Shark, Mr. Shark, what time is it?" The big difference is that this game is played in a swimming pool, lake, or other swimming area. When Lunch Time is called the player may try running through the water or swimming to get away from the shark.
A variant also exists in which the tagged players become wolves themselves, helping to tag the other players. The original wolf, however, still calls the numbers.