Buzz

Buzz is a simple brain game.

Required equipment
The game can be played without any equipment.

Procedure
The players stand up (or sit) in a circle (or any other defined sequence). One after the other start to count, the first player beginning by "1", then the second player "2" and so forth. The hard thing is, all numbers devisible by seven (without remainder) may not be pronounced; instead, those numbers are replaced by the word "buzz". So, the sequence actually starts with:

1, 2, 3, 4, 5, 6, buzz, 8, 9, 10, 11, 12, 13, buzz, 15 ...

Additionally, when a number contains the digit "7", this digit is also replaced by "buzz". So, "17" is pronounced as "ten buzz", "175" as "one hundred buzz five", "767" as "buzz sixty buzz". If a number both contains a "7" and is devisible by seven without remainder, only one "buzz" is to be said ("77" is not pronounced "buzz buzz", but only "buzz", since 77 / 7 = 11).

Whenever a player makes a mistake, he drops out of the game (or gets a negative point, etc.). This includes wrong numbers pronounced, wrong counting, pronounciation of "buzz" where a number should be said, thinking for too long, etc.

Variants of the game
Several modifications to the basic rules can be applied.
 * another single-digit number can be used (take 3 for a lot of buzzes)
 * more than one digit can be forbidden (probably, with an additional word to replace the digit/number)
 * you could change the direction of the game whenever the forbidden digit is part of the number

Teiler 7