
A daily HF radio propagation puzzle where you bounce signals off the ionosphere. Free, ad-free, no login. Puzzle/simulation.
Skywave was submitted to SlowDen by DEXM Labs (Arthur Jones). SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-14. It runs in the browser with no download, no install and no sign-up.