LeetChess

LeetChess is a lightweight chess puzzle browser extension that transforms your new tab into a powerful daily training tool. Solve chess puzzles every time you open a tab and steadily improve your tactics, calculation, and overall strategy. No account required. Comes with multiple difficulty levels so that you can choose puzzles that match your skill level. - Easy (<1200) - Medium (1200–1800) - Hard (1800–2400) - Expert (2400+) - Speedrun Mode (60-Second Challenge) Monitor your improvement in tactics and calculation over time. Also comes with Work Mode for when you need to get things done, which is a clean interface with a motivational chess quote overlay.