The largest online chess platform with real-time and daily games, variants, bots, and a free tier limited to a few puzzles and one game review per day; premium unlocks unlimited analysis and lessons.
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byG-Hubs
Sudoku.com
sudoku.com
Classic Sudoku by Easybrain with web and mobile apps, six difficulty levels, daily challenges, seasonal events, and offline play for casual brain training.
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byG-Hubs
Lichess
lichess.org
Completely free, ad-free open-source online chess server with unlimited games, Stockfish analysis, puzzles and variants. Built for players who want serious training tools without paywalls.
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Minesweeper Online
minesweeper.online
Browser-based classic Minesweeper with no-guess mode, competitive leaderboards, quests, arena, and multiplayer for logic and speed players.