Most of the game software sold for PDA's are below twenty five dollars, they are not expensive at all. And in some cases if you have access to the internet you can actually download different types of games and versions for PDA for absolutely no cost to you at all.
The graphics on the PDA are pretty good, and depending on what style or brand of PDA you have will let you know how the game is going to perform. And how well you will be able to see the game screen shots too. Different games, such as card games or other games will play a lot more effectively rather than if you choose to play a game where the display screen is constantly. This of course uses memory and its best if you are playing games that no other programs are running on your PDA at that time.
For example, if you are playing a game and listening to mp3's at the same time your PDA is going to run slower, therefore the game you are playing will run slower as well. With this in mind, all you need to do is one or the other. Then, when you are finished start the program back that you need to or want to.
In most cases if you are adding appointments to your PDA and listening to mp3's your PDA shouldn't actually perform any slower, the main fact is that game programs need memory to perform the way they should. With setting appointments all you are using basically is your virtual keyboard, and this does not take much memory at all.
Also some game programs are bigger than others, so you might want to take this into consideration when installing them on your PDA too, the game you install does use memory space. You have to keep in mind the amount of space your PDA actually has.
Some games that are made specifically for the PDA can be transferred to another PDA by using "beam" or the infrared port. This doesn't always work, however for some of the games that don't use a lot of memory, it will work. This way you and your friend both have the same games. It is also a good way to share games that one or the other may not have but wants to play.
Unfortunately however, you both can't play the same game against each other using the beam technique it is only designed to transfer files from one PDA to the other. In some cases however, among the more expensive PDA's cables are sometimes used.