Each level featured a single paper with 5 geometry problems to be solved in 4 hours and 30 minutes.
One notable problem from the 2017 elementary level involved 100 points on a plane, where participants had to prove a specific property of "clockwise triangles"—the problem was clever enough that it actually used the year "2017" as a target value within its proof. iGO 2017
A series of personalized travel books for children launched around 2017, sweepingly taking kids on "adventures" through cities like London. Each level featured a single paper with 5
Nearly 4,000 contestants from 40 different countries participated in the 4th IGO. iGO 2017