Using just four sixes, parentheses where necessary, and the following seven symbols as needed:
+ - x / . ! √
find an expression for 29.
Five 6's is easy enough: 6*6 - 6 - 6/6 = 29. But we only have four 6's available.
Sqrt seems rather odd for a problem dealing with 6's, so I deduced that at least one was mandatory. Playing around I found sqrt(6!+11^2) = 29, then how to get 11^2 in three 6's?
Actually not too hard: (6!+6)/6 = 121.
Then the answer is sqrt[6!+(6!+6)/6] = 29.
Solution