For games which are released in different years, append the year (if needed, shortened to two digits):
nfs-most-wanted-2005 vs. nfs-most-wanted-2012
... or ...
nfs-most-wanted-05 vs. nfs-most-wanted-12
... or ...
legend-1984 vs. legend-1989 vs. legend-1991 vs. legend-1992 vs. legend-1994 vs. legend-1998 vs. legend-2009 *)
The first version is preferred if the tag length allows for it to not be so easily confused with serial numbers.
For the very unlikely case of games released in the same year, or where the name or serial number includes a year-like string, append one of the following, in decreasing order of usefulness:
- the publisher or studio (whatever is more well known)
- the platform, if the games are single-platform games for different ones
- the genre
- the country of origin
Example (both released 2009)**)
pinball-magma-mobile vs. pinball-tiny-diversions
... or (in case those tags would be too long) since both are single-platform releases ...
pinball-android vs. pinball-ios
*) Source: GameFAQs. If I missed any, correct me please.
**) Sources: Magma Mobile web page ("Magma Mobile launched the first Android Pinball game in October 2009") and Apple's iTunes store ("Released: Feb 10, 2009").