Plain Game is a free browser game where you guess a number to raise a plane. The daily flight has 7 questions with 30 seconds each. Practice mode is unlimited, with relaxed and no-timer options.
You can play friend matches by link, or live 1v1, cups and leagues. Guests can play without an account or download, while ranked matchmaking needs an account. It runs in phone and desktop browsers, is English only, and the site mentions no paid tiers or ads.
Plain Game turns a quick numeric guess into a short browser game with a daily flight, practice and friend matches, with no download needed.