Solution

26041

Problem / game
Unlocking the case Back to problem
First name
Rhys Horsley
School
O.L.O.R Kellyville
Country
Australia
Age
9

My answer is 256

The T in the clue represents the word triangle.
I drew 16 rows of triangles, with each row having 2 more triangles than the row before.

I added up all the little triangles and the answer was 256.