How play games with CD ROM with case gaming?

you can have a burn iso of the cd file
then read it with a virtual disk reading tool like deamon tool

You could also get yourself a USB CD/DVD reader. They're usually quite cheap, and it's always convenient to have one if you still have some old CDs laying around the house.

I don't get it, you mean you have a computer without an hard-disk? If so, you can't play cd/dvd games because they need installing into an hdd, which has to have an operating system installed. If I got it wrong, then follow the previous suggestions.

buy an external CD/DVD drive. they are around 20€ so a fair price

how for why things I understand won't to do without I want but that is from speaking where something goes.

gog.com

If you have an other computer with CD/DVD drive (older PC or laptop), you can prepare an image file there, and use an CD/DVD emulator on the current machine.
CloneCD is a friendly little software for doing that: https://www.elby.ch/products/vcd.html
And the first comment mentioned Daemon Tools already, https://www.daemon-tools.cc/home

However, if you do not have easy access to a CD/DVD drive at all, buy an external one as suggested. Btw. after getting an external drive you can still create and emulate image files, so you do not have to worry about the physical handling of the discs. Image files do not get scratched for example.

If you are asking how to install those games without an internal drive -> get an usb dvd drive (which are also able to bypass regiolocked dvd films)
In case you want to know how to launch the games without the constant need of a cd drive afterwards: either mount them as an iso file or sometimes you can find a patch that removes the need for the cd.

Uhm, too much eggnog? :) Joke aside, I think the translation might be:

I have case gaming

I have a gaming PC

without the harddisk for works the CD ROM,

without a CD/DVD drive

but how i play now the games with cd rom?

How can I play games from or that require physical CD/DVDs.

If that's what you meant, you can:

• buy or borrow an external DVD drive and use it to read/use your physical media.
• temporarily use an internal DVD drive to read/use your physical media.
• find or create an image of that game and mount it with any software that allows it.
• search for a digital version of that game and use it instead.