January 2006.
IMac - Intel-based - was created in 2006.
Intel microprocessor-based computer running the Apple Macintosh operating system; Intel-Macintosh computer; IMac computer; iMac computer
An "Intel-based iMac G5" would be an oxymoron. The "G5" part of it's name refers to having a PowerPC processor.
The original iMac G3 was introduced in 1998. The iMac G5 which placed all the components behind the screen came out in 2004.
Early 2008, Intel Core 2 Duo, AliMac 2.4GHz Intel Core 2 Duo 20-inch (Al)iMac 2.66GHz Intel Core 2 Duo 20-inch (Al)iMac 2.8GHz Intel Core 2 Duo 24-inch (Al)Early 2009, Intel Core 2 Duo, AliMac 2.66GHz Intel Core 2 Duo 20-inch (Al)iMac 2.66GHz Intel Core 2 Duo 24-inch (Al)iMac 2.93GHz Intel Core 2 Duo 24-inch (Al)iMac 3.06GHz Intel Core 2 Duo 24-inch (Al)Mid 2009, Education Institutions OnlyiMac 2.0GHz Intel Core 2 Duo 20-inch (Al)* Design: Edge-to-edge glass/seamless enclosure debutLate 2009, Core i5/i7 quad-core processors availableiMac 3.06GHz Intel Core 2 Duo 21.5-inch (Al 16:9)iMac 3.06GHz Intel Core 2 Duo 21.5-inch (Al 16:9)iMac 3.06GHz Intel Core 2 Duo 27-inch (Al 16:9)iMac 2.66GHz Intel Core i5 27-inch (Al 16:9)
When Apple switched to the Intel Processor.
The G5 does not have an Intel processor it has an IBM Power PC processor.
The iMac uses an Intel Core 2 Duo processor which is a 64 bit processor.
Sims 3 will not work with a G4 iMac. The game requires a recent Mac with an Intel processor.
Only if you have a Mac version of this game or you have the Windows version and you have Windows installed on your Intel iMac.
The short answer is no, FlyFF requires DirectX, which is only available on a Windows system. However, if you have a newer Intel-based iMac, it is possible to run Windows on your Mac. This is addressed in a separate question - see related link below for details.
The original iMac was the G3 which came out in (1998). It was followed by the G4 (2002), then the G5 (2004), then the Intel iMac plastic version (2006). The 5th iMac was the aluminum iMac which came out in (August 2007), followed by the iMac Aluminum Unibody (2009). The newest iMac is simply called 2012 iMac and it came out on November 30, 2012.