Lobby
Featured
Newton Round #13
Creators to be announced
A fresh set of problems across mechanics, electricity, waves, and heat. Open to every level.
Nov 7, 2026 · 16:00 UTC
90 minutes5 problems
Demo signup only. Nothing is sent or saved.
Recommended For You
Waves
3 minReading between the waves
Wave speed · 900
Your rating
Demo
Elo
Specialistin the last 3 months
Rating history
#247 overallView rankings
Solved correctly0
Problems you have answered correctly.
No correct answers yet
Correct practice and contest answers will appear here.
Not yet correct0
Incorrect attempts you have not yet solved correctly.
Nothing to retry
Problems you answer incorrectly will appear here until you get them right.
Checked practice and contest answers from this session only. History resets on reload; self-reviewed IPhO questions are not graded.