Project Euler on College Application

If I have solved multiple problems on this website (projecteuler.net) and I am among the top 1% of solvers among thousands, is that something worth noting down on the college application? Is it seen as a good thing?

Sure, if you have room, go ahead and list it. Have you tried the USACO challenges? They are similar. Their first contest for 2019-20 will probably be in December, but November is possible.