Real Arcade Games Playable Online: Legal & Free Options

1. Official Browser Ports (Free, Legal)

• Internet Archive – Arcade Collection: Hundreds of MAME ROMs playable in-browser (JSMAME). Pac-Man, Donkey Kong, Galaga, Street Fighter II, Mortal Kombat, Metal Slug, etc.
• Atari 50 / Atari Vault (Steam/Epic): Official emulated classics.
• Arcade Archives (Hamster) – Switch/PS4/Xbox/PC: Paid, but authentic.

2. Emulation + Verified ROMs (Legal Gray Area – Own Original)

• MAME (mamedev.org): Gold standard emulator. Use with verified ROM sets (No-Intro, Redump, Internet Archive "MAME 0.250 ROMs").
• RetroArch + FBNeo / MAME cores: Cross-platform, shader support, netplay.
• RetroPie / Batocera: Raspberry Pi / PC images – turn device into arcade cabinet.

3. Modern Games with Arcade Feel (Steam/itch.io)

• Shovel Knight, Cuphead, BlazBlue: Cross Tag Battle, Fight'N Rage, Neon Abyss, Downwell, Enter the Gungeon – arcade design, modern polish.

4. Browser Remakes / Clones

• Pac-Man (Google Doodle / Namco Bandai official)
• Tetris (tetris.com – official free)
• Asteroids, Breakout, Space Invaders – many HTML5 clones on GitHub Pages.

⚠️ Legal Note

Downloading ROMs for games you don't own is copyright infringement in most jurisdictions. Internet Archive's in-browser MAME is the safest "free & legal-feeling" route – they claim library/archive exemption.