Make problems 101 - 200 open book, just like problems 1 - 100.

[pleasant.timepass]

Problems 1 - 100 are all relatively easy and a good training ground in the basics. Problems 101 - 150 are harder and provide a better training ground; of course, Problems 151 - 200 are quite difficult and provide even better training ground. Given all the answers and solutions are already readily available on the web and are accessible with a GenAI, why not just declare Problems 101 - 200 also open book. These problems are more representative of the difficulty and subject matter of later problems in Project Euler, compared to the first 100 problems.