Guess It! is currently available for two platforms : Pocket PC (Windows Mobile 2003/5.0) and PC (Windows 95/98/ME/2000/XP/Vista)
You get both versions for the price of one !

For the Pocket PC platform
Pocket PC running Windows Mobile 2003 or Windows Mobile 5.0 (Windows Mobile 2005)
About 3 MB free storage
About 10-13 MB free program memory

For the PC platform
PC running Windows 95/98/ME/XP/Vista
Microsoft .Net Framework 2.0 (will be downloaded if necessary during installation)
4 MB free disk space

Guess It! features high-quality VGA and QVGA graphics as well as 44 kHz high-quality sound!

Guess It! has two modes : arcade mode with more than 30 levels, and quick game mode. Both modes ensure you get hundreds of hours of pure gameplay.
Moreover, the game features 3 mentors to make it more enjoyable, more defying, and long-living!

Despite high-quality graphics and sound, Guess It! remains lightweight and should run on merely any Pocket PC. It can also be installed anywhere : so, if you want to save internal storage, you can install the game on a storage card.
The PC version should run on any modern PC.