You can find out by giving these problems a try. For comparison, here is an 8th grade contest from Math League, which I am not familiar with at all.It definitely wins in the cool pictures category. I suppose you wouldn’t want 8th graders to get bored while solving math problems in a competition. (There is a nontrivial risk of boredom, actually.) To be fair, one can find much better math competition problems in the US, like this one, called Abacus. By a remarkable coincidence, “[t]he program is based on a printed journal for gifted students, originating in Hungary over 100 years ago.”