System Requirements

Windows users:
2 GB RAM
Windows XP/7/8
Dedicated video card with 64+ MB on-board RAM
Internet Explorer (recommended)
Unity Web Player 4.3+

Mac users: 
2 GB RAM
Mac OS X 10.6 or newer
Dedicated video card with 64+ MB on-board RAM
Safari (recommended for OS 10.6-10.9)
Unity Web Player 4.3+