Best Free Browser Games (No Download Required)

Action / .io

• Agar.io / Slither.io — Eat/grow, avoid bigger players.
• Diep.io — Tank upgrade tree, arena combat.
• Krunker.io — Fast FPS, runs in browser.

Puzzle / Brain

• Sudoku.com, KenKen, Nonograms
• Tetris (tetris.com) — Official, touch-friendly.
• Wordle / Quordle / Waffle — Daily word puzzles.
• Chess.com / Lichess — Play, puzzles, analysis.

Social / Party

• Skribbl.io — Pictionary clone.
• Gartic Phone — Telephone + drawing.
• Codenames (codenames.game) — Team word clueing.
• Among Us (browser via now.gg) — Social deduction.

Geo / Trivia

• GeoGuessr (free limited) — Street View location guess.
• Sporcle — Timed quizzes on everything.

Discovery Hubs

• CrazyGames, Poki, Kongregate (HTML5), itch.io (web)

All run in Chrome/Edge/Firefox/Safari — no install, no account required (mostly).