three ways on the top of my head
waydroid
waydroid runs android in a linux container
it is the easiest to play roblox when wine support is dropped… just that the mobile client is still horrible for keyboard and mouse input
please note that waydroid only works on wayland desktop envoirments. if you are using X, install weston with your package manager
weston will allow you to run a wayland session in a window
kvm with gpu passthrough
you can run roblox in a windows virtual machine with the kvm hypervisor with full gpu access
this method is trial and error and may require you to do hours of research just to successfully passthrough a gpu
this should be done with two gpus, one for the host, and one for the virtual machine
doing this on a single gpu may introduce issues and you will not be able to control the linux host until the virtual machine is powered off (access with ssh is an option)
also, you may want to passthrough other devices to make the virtual machine appear more legitimate
https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF
the last time i ran roblox with a virtual machine, they did not allow it
do at your own risk
dual boot
as the name suggests, install windows alongside linux